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.NET W ^

Core .NET by Jon Skeet [pdf] (dzone.com)
.NET Format String Quick Referencee [pdf] (john-sheehan.com)
.NET Framework 4 and Extensions [pdf] (msdn.microsoft.com)
Regular Expression Cheat Sheet (.NET) [html] (regexlib.com)

Official website: dotnet.microsoft.com

See also: ADO.NET, ASP, C#, MFC, Sandcastle, Visual Basic, Windows Communication Foundation

Ada W ^

Ada 2022 Reference Card by Bent Bracke [pdf, latex] (github.com/bracke)
Ada Reference Card by DAINA [pdf]
Ada Syntax Card by DAINA [pdf]

ADO.NET W ^

ADO.NET Entity Framework: Object-Relational Mapping and Data Access by Dane Morgridge [pdf] (dzone.com)

Official website: learn.microsoft.com/en-us/dotnet/framework/data/adonet/

Adobe Systems W ^

The Ultimate Adobe Creative Cloud Keyboard Shortcuts Cheat Sheet by Jamie Spencer [html, jpg] (makeawebsitehub.com)
Adobe CC Keyboard Cheat Sheet For Web Designers 2016 by Jamie Spencer [html, jpg] (makeawebsitehub.com)
Adobe CC Photographers Keyboard Shortcuts Cheat Sheet 2016 by Jamie Spencer [html, jpg] (makeawebsitehub.com)

Official website: adobe.com

See: Adobe Acrobat, Adobe ColdFusion, Adobe Illustrator, InDesign, Adobe Photoshop,

Adobe Acrobat W ^

Cheat sheet:

Adobe Acrobat Quick Reference, Abobe Acrobat 8 Cheat Sheet [pdf]
2015 Adobe Acrobat DC Keyboard Shortcuts Cheat Sheet by Jamie Spencer [html, jpg] (makeawebsitehub.com)
Acrobat Pro DC by Ton Haarmans [pdf] (wideopenwindows.be)

Official website: adobe.com/products/acrobat/

AJAX - Asynchronous JavaScript And XML W ^

Getting Started with Ajax by Dave Crane [pdf] (dzone.com)
JavaScript in one page [html] (javascript.su)
JavaScript Cheat Sheet by Dave Child [png, pdf] (addedbytes.com)
AJAX Activity Indicators [html] (ajax.su)

See also: CSS, DOM, GWT, JavaScript, jQuery, Prototype, RichFaces

Algebra W ^

Algebra Cheat Sheet by Paul Dawkins [pdf, pdf reduced] (tutorial.math.lamar.edu)
Abstract Algebra Cheat Sheet by Brendan Kidwell, based on Dr. Ward Heilman’s notes for his Abstract Algebra class [pdf] (glump.net)
Review of Algebra by Thompson Brooks-Cole [pdf] (docstoc.com)

Tools: WolframAlpha

See also: Math

Amazon Web Services (AWS) W ^

AWS Command Line Interface User Guide [html, pdf] (aws.amazon.com)
Awesome AWS Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: aws.amazon.com

Android W ^

Android Classes (Android SDK) by Frank Hunleth [pdf]

Official website: www.android.com

Apache W ^

Apache Cheat Sheet [html] (petefreitag.com)
Apache 1.3 Quick Reference Card by Andrew Ford [png, pdf] (refcards.com)

Official website: httpd.apache.org

See also: htaccess, mod_perl, mod_rewrite, Apache Ant, Apache Camel, Apache Hadoop, Apache HBase, Apache Maven, Apache ServiceMix, Apache Solr, Apache Wicket, Lucene, SSI, Tapestry

Apache Ant W ^

Getting Started with Apache Ant by James Sugrue [pdf] (dzone.com)

Official website: ant.apache.org

See also: Apache

Apache Camel W ^

Enterprise Integration Patterns W ^ with Apache Camel by Claus Ibsen [pdf] (dzone.com)

Official website: camel.apache.org

Apache Cassandra W ^

Apache Cassandra: A Fault-Tolerant, Massively Scalable NoSQL Database by Brian O’Neill [pdf] (dzone.com)

Official website: cassandra.apache.org

Apache Solr W ^

Apache Solr: Getting Optimal Search Results by Chris Hostetter [pdf] (dzone.com)

Official website: http://lucene.apache.org/solr/

APT - Advanced Packaging Tool W ^

APT HOWTO [html] (debian.org)

Arduino W ^

Arduino Cheat Sheet by Gavin Smith [pdf, png] (sites.google.com/site/mechatronicsguy/)

Official website: www.arduino.cc

ASCII - American Standard Code for Information Interchange W ^

ASCII Table by Alexander Krassotkin [html] (ascii.ru)
ASCII Character Codes Table & Cheat Sheet [html] (petefreitag.com)
Web ASCII, aka Windows-1252 Character Encoding by Bob Stein, VisiBone [html] (visibone.com)
ASCII Table by Michael Goerz [tex, a4 pdf, letter pdf, png] (users.physik.fu-berlin.de/~goerz/)

ASP - Active Server Pages W ^

Core ASP.NET by Holger Schwichtenberg [pdf] (dzone.com)
ASP / VBScript Cheat Sheet by Dave Child [png, pdf] (addedbytes.com)
ASP.NET 2.0 Page Life Cycle & Common Events [pdf] (john-sheehan.com)
Getting Started with ASP.NET MVC 1.0 by Simone Chiaretta and Keyvan Nayyeri [pdf] (dzone.com)

Assembly Language W ^

Cheat sheets:

Intel Assembly 80x86 CodeTable by Roger Jegerlehner [pdf] (www.jegerlehner.ch/intel)
Win32 Assembly Cheat Sheet by Peter Kankowski [png] (strchr.com)
gcc x86 Assembly Quick Reference ("Cheat Sheet") by Peter O. Lawlor [html] (cs.uaf.edu)
Intel x86-64 Architecture by Michael Stumpfl [pdf]
6502 (65xx) Microprocessor Instant Reference Card (instruction set and conversion) by James D. Lewis [pdf]
SY6500 Instruction Set Summary and Assembler Directives (6502 - Reference Cards) by ATARI [pdf]

Documentation, Books, Articles:

Assembly languages [html, pdf] (wikibooks.org)
ASM Community • The Assembly Language Resource [html] (asmcommunity.net)
Programming from the Ground Up by Jonathan Bartlet; Edited by Dominick Bruno, Jr [html, pdf]
PC Assembly Language by Paul A. Carter [pdf] (drpaulcarter.com)

Astronomy W ^

SOLAR SYSTEM CHEAT SHEET (metric) by Bryan English [pdf] (bluelinecity.com)

Tools: WolframAlpha

AWK - Aho, Weinberger and Kernighan programming language W ^

AWK (Aho, Weinberger and Kernighan) Summary (awk cheat sheet) by Peteris Krumins [doc, pdf, txt] (catonmat.net)
awk Quick Ref compiled by Vincent Ledos [pdf]
tldr awk [html] (cheat-sheets.org)

Azure (Azure Services Platform, Windows Azure Platform) W ^

Cloud Computing with Windows Azure Platform by Brian H. Prince [pdf] (dzone.com)

Official website: www.microsoft.com/windowsazure/

Bazaar (formerly Bazaar-NG, commandline tool bzr) - distributed revision control system W ^

Bazaar Quick Start Card [pdf, png, svg] (bazaar-vcs.org/)

Official website: bazaar-vcs.org/

Berkeley DB (BDB, Oracle Berkeley DB) W ^

Getting Started with Oracle Berkeley DB by Masoud Kalali [pdf] (dzone.com)

Official website: oracle.com/database/berkeley-db/db/

Big OW ^

BIG-O-CHEATSHEET [png] (bigocheatsheet.com)
Big-O Poster by ro31337 [pdf] (github.com)

BIRT - Business Intelligence and Reporting Tools Project (BIRT Project) W ^

Getting Started with BIRT by Virgil Dodson [pdf] (dzone.com)

Official website: eclipse.org/birt/

Blogger W ^

Blogger. IDENTIFICADORES Y CLASES EN LAS PLANTILLAS. [pdf] (btemplates.com)

Official website: www.blogger.com

Blueprint - CSS framework W ^

Blueprint CSS by Gareth J M Saunders, based on Help Sheet v.0.3 by Alejandro Vasquez [pdf] (garethjmsaunders.co.uk)

Official website: www.blueprintcss.org/

BPEL - Web Services Business Process Execution Language (WS-BPEL) W ^

Core WS-BPEL: Business Process Execution Language by Matjaz B. Juric [pdf] (dzone.com)

Official website: OASIS WSBPEL TC Webpage

Business Process Modeling (BPM) W ^ and Business Process Modelling Notation (BPMN) W ^

Effective Process Modeling with BPM & BPMN by Matjaz Juric and Ana Sasa [pdf] (dzone.com)

Official website: bpmn.org

C W ^

C Reference Card (ANSI) by Joseph H. Silverman [pdf, dvi, TeX source] (math.brown.edu/~jhs/)
ANSI C Quick Reference Card by Joseph H. Silverman (refcards.com copy) [pdf, old version pdf] (digilife.be, refcards.com)
C Cheat Sheet by Jill Crisman [html] (faculty.olin.edu/~jcrisman/)
Awesome C Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

See also: C#, C++, GDB, Objective-C, OpenMP

C# W ^

C# Development by Jon Jarboe and Eric Lippert [pdf] (dzone.com)
Core C# and .NET Quick Reference by Stephen C. Perry [pdf] (digilife.be)
C# and VB.NET Comparison Cheat Sheet by Steven Swafford [html, pdf, doc] (aspalliance.com)
Awesome C# Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: https://learn.microsoft.com/en-us/dotnet/csharp/

C++ W ^

C++ Quick Reference Sheet (Cheat Sheet) [pdf] (dreamincode.net)
C/C++ Cheat Sheet (v1) by Jared Schiffman [pdf] (itp.nyu.edu)
C/C++ Cheat Sheet (For your reference; this sheet will also be included in exams) [pdf] (research.cs.queensu.ca)
How to Program in C++ by Matt Mahoney [html] (cs.fit.edu/~mmahoney/)
C++ QUICK REFERENCE by Matt Mahoney [html] (sourcepole.com/sources/programming/cpp/cppqref.html)
STL Quick Reference 1.29 by Yotam Medini [pdf] (digilife.be)
C++ Standard Algorithms, Randomness, Random Sampling Distributions, Sequence Views, Containers, Utilities, Language Rules & Mechanisms, Lambda Expressions Syntax, Non-Standard Libraries, Design Guidelines, Engineering and Terminology by André Müller [html, png] (hackingcpp.com)
C++ Containers Cheat Sheet [html] (linuxsoftware.co.nz)
C++ Iterators & Algorithms Cheat Sheet [html] (linuxsoftware.co.nz)
Shifting from C to C++ strings [html] (linuxsoftware.co.nz)
Cheat Sheet: Unicode-enabling Microsoft C/C++ Source Code [html] (i18nguy.com)
Understanding C++/Quick Reference [html] (en.wikibooks.org)
CPPTEST CHEATSHEET by Shane McDonald [pdf] (cpptest.sourceforge.net)

See also: .NET, ASP, C, C#, GDB, MFC, Objective-C, OpenMP, Qt, Visual Basic

Calculus and Analysis W ^

Complete Calculus Cheat Sheet by Paul Dawkins [pdf, pdf reduced] (tutorial.math.lamar.edu)
Limits Cheat Sheet by Paul Dawkins [pdf, pdf reduced] (tutorial.math.lamar.edu)
Derivatives Cheat Sheet by Paul Dawkins [pdf, pdf reduced] (tutorial.math.lamar.edu)
Integrals Cheat Sheet by Paul Dawkins [pdf, pdf reduced] (tutorial.math.lamar.edu)
Common Derivatives and Integrals by Paul Dawkins [pdf, pdf reduced] (tutorial.math.lamar.edu)

Tools: WolframAlpha

See also: Math

Camera W ^

Complete listing of common camera symbols [html] (photonotes.org)

Catalyst W ^

Cheat sheets: Catalyst Quick Reference Card by Andrew Ford [pdf]	Documentation, Books, Articles: Catalyst::Manual [pdf] (cpan.org)
Official website: catalystframework.org See also: Perl

Characters W ^

HTML/XHTML Character Entities in one page [html] (html.su)
URL Encoded Characters [html] (html.su)
HTML Character Entities Cheat Sheet by Dave Child [png, pdf] (addedbytes.com)
Character Entity References in HTML 4 and XHTML 1.0 [html] (cookwood.com)
Reference: Special Characters [html] (webmonkey.com)
HTML Entities Cheatsheet & Online Reference [html] (explainth.at)
The Unicode Character Code Charts [html] (utf.ru)
Free Unicode Fonts [html] (font.su)
Windows - Alt Key Numeric Codes [html] (tlt.its.psu.edu)
HTML Characters, Alpha Codes by Bob Stein, VisiBone [html] (visibone.com)
Webdings, special nearly useless symbols (e.g. ‘ O 6 þ ) Also DingbatsOne, DingbatsTwo, Wingdings, Zapf Dingbats BT by Bob Stein, VisiBone [html] (visibone.com)
HTML Entiteiten (Dutch) by Ton Haarmans [html] (wideopenwin.com)

Tools: WolframAlpha

Chef W ^

Chef: An Open Source Tool for Scalable Cloud and Data Center Automation by Jeffrey Hulten [pdf] (dzone.com)

Official website: www.opscode.com/chef/

Chemistry W ^

Periodic Table of the Chemical Elements [html] (chemistry.su)
Periodic table [html] (wikipedia.org)
Math for Chemistry Cheat Sheet [pdf] (chemistrysurvival.com)
200 Ways to Pass the Chemistry Physical Setting Regents Exam [pdf] (newyorkscienceteacher.com)
Chemistry Salt Analysis Cheatsheet by Ankur Banerjee [pdf] (scribd.com)
Basic Chemistry Conversion Cheat Sheet by B.Espinoza [doc, pdf] (starmail.adams12.org/~mica.brougham@Adams12.org/)
AP Chemistry 2004 Free-Response Questions by CollegeBoard [pdf] (collegeboard.com)

Tools: WolframAlpha

chmod W ^

Chmod chart [html] (draac.com)

Clojure W ^

Functional Programming with Clojure Simple Concurrency on the JVM by Tim Berglund and Matthew McCullough [pdf] (dzone.com)

Official website: http://clojure.org/

Cloud Computing W ^

Getting Started with Cloud Computing by Daniel Rubio [html] (dzone.com)

Official websites:

See also: Google App Engine, Scalability and High Availability, Windows Azure

Cocoa W ^

Cocoa Framework (iOS SDK 3.0) by Alexey Nazaroff [pdf]

Official websites:

ColdFusion W ^

ColdFusion Cheat Sheet [html] (petefreitag.com)
CFSCRIPT ColdFusion Cheat Sheet [html] (petefreitag.com)
Getting Started with ColdFusion 9 by Terry Ryan [pdf] (dzone.com)
Getting Started with Adobe ColdFusion Builder by Terry Ryan [pdf] (dzone.com)
Leveraging ColdFusion 9 Exposed Services from Java by Mark Mandel [pdf] (dzone.com)
Adobe® ColdFusion Web Services for PHP Programmers by Marco Tabini [pdf] (dzone.com)
ColdFusion Builder 2: Faster Coding, Less Errors by Terry Ryan [pdf] (dzone.com)

Official website: http://www.adobe.com/products/coldfusion

Colour W ^

RGB Hex Colour Chart by Dave Child [png] (addedbytes.com)
Web Designer's Color Card/Font Card by Bob Stein, VisiBone [poster 22cmx28cm, gif/jpg] (visibone.com)
The 216-Color Webmaster's Palette Poster by Bob Stein, VisiBone [poster 46cmx61cm, jpg] (visibone.com)
Web Designer's Color Chart by Bob Stein, VisiBone [poster 46x61cm, gif] (visibone.com)
Web Color KiloChart by Bob Stein, VisiBone [poster 46x61cm, jpg] (visibone.com)
Web Designer's Color Hexagon Mouse Pad by Bob Stein, VisiBone [Mouse Pad 22cmx24cmx0.6mm, gif] (visibone.com)
CMYK Reference by VisiBone [pdf] (visibone.com)
Web Safe Colors [html] (cookwood.com)
Colors from the Inside Back Cover [html] (elizabethcastro.com)
Reference: Color Codes [html] (webmonkey.com)

Tools: WolframAlpha

Computer Science W ^

Theoretical Computer Science Cheat Sheet [pdf] (tug.org)

Continuous Integration (CI) W ^

Continuous Integration: Patterns and Anti-Patterns by Paul M. Duvall [pdf] (dzone.com)
Continuous Integration: Servers and Tools by Paul M. Duvall [pdf] (dzone.com)

Countries W ^

ISO 3166-1 code list, sorted by English short name of country or territory [html] (wikipedia.org)

Cron W ^

Cron cheatsheet by Rico (@rstacruz) [html] (devhints.io)

CSS - Cascading Style Sheets W ^

CSS in one page [html] (css.su)
CSS Level 1 Quick Reference DeepX Ltd [pdf] (refcards.com)
CSS Level 2 Quick Reference Benjamin Jung [pdf] (refcards.com)
2016 CSS Cheat Sheet Infographic by Jamie Spencer [html, jpg] (makeawebsitehub.com)
CSS Cheat Sheet by Dave Child [html, png, pdf] (cheatography.com)
CSS Cheat Sheet [html] (petefreitag.com)
CSS Properties and Values by Dave Child [html] (elizabethcastro.com)
CSS 2 - Quick Reference Guide [pdf] (veign.com)
CSS2.1 Quick Reference Card [pdf] (explainth.at)
Apple’s CSS Cheat Sheet [html.zip] (apple.com)
CSS CHEAT SHEET [html] (lesliefranke.com)
Cascading Style Sheets 1.0 [pdf] (digilife.be)
CSS Property Index [html] (blooberry.com)
CSS Shorthand Guide [html] (dustindiaz.com)
XPath, CSS, DOM and Selenium: The Rosetta Stone by Michael Sorens [pdf: Locators table, Locators groups] (simple-talk.com)
CSS Cheat Sheet by Robert Duncan [html] (simplehtmlguide.com)
Ultimate CSS Cheatsheet by Matt Ahlgren [png, pdf] (websitehostingrating.com)
Awesome CSS3 Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: http://www.w3.org/Style/CSS/

See also: Blueprint, DOM, HTML, JavaScript, Selenium, XHTML, XPath

curl (cURL, Curl) W

Awesome Curl Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: curl.se (github.com/curl)

CVS - Concurrent Versions System W ^

CVS Cheat-sheet [html] (slac.stanford.edu)
CVS Quick Reference Card Andrew Ford [pdf] (refcards.com)
CVS Quick Reference Card by Laurent Grégoire [dvi, pdf, TeX] (tnerual.eriogerg.free.fr)
tldr cvs [html] (cheat-sheets.org)

Dart W

Dart language cheatsheet [html] (dart.dev)
Dart cheatsheet codelab [html] (dart.dev)
Dart 2 Cheat Sheet and Quick Reference by Razewarre LLC. [pdf] (raywenderlich.com)
Dart cheatsheet [html] (quickref.me)
dart-cheat-sheet by Temidayo Adefioye (Temidtech) [html] (github.com/Temidtech)
Dart Cheat Sheet [html] (simplecheatsheet.com)
tldr dart [html] (cheat-sheets.org)

Official website: dart.dev

Datalog W

Datalog User Manual by The MITRE Corporation [html] (datalog.sourceforge.net)
Learn Datalog Today [html] (learndatalogtoday.org)
Datalog: Deductive Database Programming by Jay McCarthy [html] (racket-lang.org)

DB2 (IBM DB2) W ^

Db2 Cheat Sheet for development by Andres Gomez Casanova [pdf] (github.com/angoca/)
DB2 cheat sheet by Alex Staveley [pdf] (dublintech.blogspot.com)
The A to Z of DB2 by Alex Staveley [pdf] (dublintech.blogspot.com)

Official website: http://www-01.ibm.com/software/data/db2/

See also: MySQL, Oracle, PostgreSQL, SQL, SQLite, Sybase

db4o W ^

Getting Started with db4o: Persisting .NET Object Data by Stefan Edlich and Eric Falsken [pdf] (dzone.com)

Official website: db4o.com

Debian W ^

TLDR Pages [html] (cheat-sheets.org)
Most used commands [html] (cheat-sheets.org)
refcard [pdf] (people.debian.org/~debacle/)

Delphi W ^

Delphi Technical Reference Card 7.20 by Gulf Coastal Software [pdf] (digilife.be)
Delphi Quick Reference Card [pdf] (explainth.at)

Official website: http://www.codegear.com/products/delphi/

Design Pattern W ^

Design Pattern Quick Reference by Jason S. McDonald [pdf] (mcdonaldland.info)
Design Patterns by Jason McDonald [pdf] (dzone.com)
Enterprise Integration Patterns W ^ with Apache Camel by Claus Ibsen [pdf] (dzone.com)

See also: Apache Camel, Computer Science, Tapestry

Django W ^

Django Cheat Sheet [pdf] (digilife.be)

Official website: http://www.djangoproject.com/

Docker W

Docker CLI Cheat Sheet by Docker [pdf] (docker.com)
The Ultimate Docker Cheat Sheet by @collabnix [html] (dockerlabs.collabnix.com)
Awesome Docker Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: docker.com

Doctrine W ^

Doctrine Cheat Sheet [pdf] (phpdoctrine.org)

Official website: http://www.doctrine-project.org/

Doctypes W ^

Doctypes for XHTML docs / Doctypes for HTML docs [html] (cookwood.com)

DOM - Document Object Model W ^

W3C DOM in one page [html] (w3cdom.org)
XPath, CSS, DOM and Selenium: The Rosetta Stone by Michael Sorens [pdf: Locators table, Locators groups] (simple-talk.com)

Official website: http://www.w3.org/DOM/

See also: CSS, DTD, HTML, Selenium, XHTML, XML, XML Schema, XPath, XSL, XSLT

Domain-driven design (DDD) W ^

Getting Started with Domain-Driven Design by Aslam Khan [pdf] (dzone.com)

Official website: dddcommunity.org

DOT language W ^

Dot by Sridhar Sarnobat [pdf]

Documentation, Books, Articles:

The DOT Language by Graphviz - Graph Visualization Software [html] (graphviz.org)

Drupal W ^

DRUPAL 6 PHPTEMPLATE THEMING CHEAT SHEET by Matt Vance [pdf] (minezone.org)
Getting Started with Drupal by Matt Vance [pdf] (dzone.com)

Official website: drupal.org

DTD - Document Type Declaration W ^

Recommended DTDs to use in your Web document [html] (w3.org)
DTD in one page [html] (xml.su)

Eclipse W ^

Eclipse CDT Keyboard Shortcuts Cheat Sheet by Etienne Savard [pdf, png 300 dpi, png 600 dpi] (symbiosoft.net)
Eclipse Keyboard Shortcuts by Jesper Kamstrup Linnet [pdf, rtf] (eclipse-tools.sourceforge.net)
Eclipse CDT 8.0 Cheat Sheet [pdf] (triada.si)
Getting Started with Eclipse by Ed Burnette & Adam Houghton [pdf] (dzone.com)
Getting Started with Eclipse RCP by James Sugrue [pdf] (dzone.com)
Eclipse Plug-in Development by James Sugrue [pdf] (dzone.com)
Eclipse Modeling Framework: Essential EMF by Ed Merks and James Sugrue [pdf] (dzone.com)
Getting Started with MyEclipse by Riyad Kalla & Jens Eckels [pdf] (dzone.com)
Eclipse Tools for Spring: The SpringSource Tool Suite by Gordon Dickens, Chariot Solutions [pdf] (dzone.com)

Official website: eclipse.org

Ed - UNIX Text Editor W ^

Ed Text Editor Summary (ed cheat sheet) by Peteris Krumins [doc, pdf, txt] (catonmat.net)
tldr ed [html] (cheat-sheets.org)

EJB - Enterprise JavaBean W ^

EJB 2.0 Matrix by Eileen Sauer [pdf] (digilife.be)
Exception Handling in EJB 2.0 by Eileen Sauer [pdf] (digilife.be)
Dependency Injection in EJB 3 by Debu Panda [pdf] (dzone.com)

Official website: java.sun.com/products/ejb/

See also: Java

Emacs W ^

GNU Emacs Reference Card by Steven Gildea [pdf] (refcards.com)
Bash Emacs Editing Mode Cheat Sheet by Peteris Krumins [html, pdf, tex, txt] (catonmat.net)
tldr emacs [html] (cheat-sheets.org)

Official website: http://www.gnu.org/software/emacs/

Erlang W ^

Erlang Cheat Sheet by Nauman Leghari [pdf] (weblogs.asp.net/nleghari/)

F# W ^

Essential F# by Chance Coble and Ted Neward [pdf] (dzone.com)

Official website: F# at Microsoft Research

Fedora W ^

TLDR Pages [html] (cheat-sheets.org)
Most used commands [html] (cheat-sheets.org)
RedHat/Fedora command cheat sheet [html] (jd40c.com)
Yum Command Cheat Sheet for Red Hat Enterprise Linux by Red Hat [html, gif, pdf] (redhat.com)

Official website: fedoraproject.org

Feed (Web Feed) W ^: AtomW ^, RSS W ^

RSS and Atom by Dave Johnson [pdf] (dzone.com)

File W ^

Every File Extension in the World [html] (techtarget.com)

Firefox W ^

Keyboard shortcuts - Perform common Firefox tasks quickly [html] (mozilla.org)
Use mouse shortcuts to perform common tasks in Firefox [html] (mozilla.org)
MOZILLA FIREFOX CHEAT SHEET [html] (lesliefranke.com)
Firefox Keyboard Shortcuts [pdf] (websupportblog.wordpress.com)
Firefox Shortcuts Sheet [html] (mouserunner.com)
Mozila Firefox Cheatsheet Infographic [pdf, png] (independent-software.com)
tldr firefox [html] (cheat-sheets.org)

Official website: http://www.mozilla.com/firefox/

FitNesse W ^

Getting Started with FitNesse by Erik Pragt [gif] (dzone.com)

Official website: http://www.fitnesse.org/

Firefox Add-ons W ^

Vimperator (W ^, vimperator.org): Vimperator Keyboard Shortcuts Visual Sheet by simplicityroad [gif] (simplicityroad.livejournal.com)
Vimperator (W ^, vimperator.org): Vimperator Cheat Sheet at Tux Training [pdf] (tuxtraining.com)

Official website: http://addons.mozilla.org/

Fonts W ^

Free Unicode Fonts [html] (font.su)
Web Designer's Color Card/Font Card by Bob Stein, VisiBone [poster 22cmx28cm, gif/jpg] (visibone.com)

Fortran W ^

Fortran 90 Reference Card by Michael Goerz [pdf, odt] (users.physik.fu-berlin.de/~goerz/)

Freeware W ^

Freeware in one page [html] (pack.su)

FTP - File Transfer Protocol W ^

Basic FTP Commands [html] (cs.colostate.edu)
List of FTP commands for the Microsoft command-line FTP client [html] (nsftools.com)
tldr ftp [html] (cheat-sheets.org)
tldr ftp (windows) [html] (cheat-sheets.org)

GDB - GNU Debugger W ^

GDB Refcard by Roland H. Pesch [pdf] (gnu.org)
tldr gdb [html] (cheat-sheets.org)

Official website: http://www.gnu.org/software/gdb/

Geometry W ^

Geometry Simple Cheatsheet [pdf] (scribd.com)
Geometry Short Quick Sheets: Triangles, Angles [pdf] (scribd.com)
Cheat Sheet for Geometry Midterm [pdf] (docstoc.com)
Measurement Formulas [pdf] (cheat-sheets.org)

Tools: WolframAlpha

See also: Math

Gift W ^

Quick links to the gift ideas [html] (giftogether.com)

Gimp W ^

Gimp Quick Reference Card [pdf] (frenchfragfactory.net)

Official website: www.gimp.org

Git W ^

Cheat sheets:

Git cheat sheet (the most important and commonly used Git commands for easy reference) [pdf] (education.github.com)
GitCheatSheet by Zack Rusin [html, png, pdf, svg] (git.or.cz)
Git cheat sheet, extended edition prepared by Jan Krueger [svg front, svg back, pdf, pdf.zip] (git.or.cz)
Git Quick Reference by Juan Pablo Justiniano [pdf] (jpjustiniano.wordpress.com)
Git cheat sheet [pdf] (git-tower.com)
Getting Started with Git by Matthew McCullough [pdf] (dzone.com)
Top 20 Git Commands With Examples by Sahiti Kappagantula [html] (dzone.com)
Git Cheat Sheet - GitHub Training [pdf] (training.github.com)
Git for Subversion Users - A Cheat Sheet by Tobias Günther [pdf] (git-tower.com)
The Simple Git Cheat Sheet – A Helpful Illustrated Guide [pdf] (finxter.com)
Basic Git commands [html] (atlassian.com)
Git for the lazy [html] (spheredev.org)
Git from the inside out by Mary Rose Cook [html] (codewords.recurse.com)
Common Git Commands by Brian Kerr [html] (guides.beanstalkapp.com/)
13 Git Commands Every Developer Must Know by Vikash Koushik [html] (rovitpm.com)
GIT Bash Commands by Adam Lusted /etoxin/ [html, md] (github.com)
git memory knots (git commands extremely short cheat sheet) by Alexander Krassotkin [html] (cheat-sheets.org)
Git Cheat Sheet [pdf] (atlassian.com)
Git Cheat Sheet by GitLab [pdf] (gitlab.com)
Yet Another Git Cheatsheet by Dumb Down Demistifying Dev (henryong92) [html] (dev.to)
Start a new git repository by Karl Broman [html] (kbroman.org)
Oh Shit, Git!?! by Katie Sylor-Miller (ksylor) [html] (ohshitgit.com)
Git: Cheat Sheet (advanced) by Maxence Poutord (maxpou) [html] (dev.to)
Git Cheat Sheet: Commands and Best Practices by Simon Maple [html] (jrebel.com)
tldr git [html] (cheat-sheets.org)
See also: git init, git clone, git add, git status, git commit, git remote, git push, git pull, etc.
Awesome Git Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Documentation, Books, Articles:

Git /The official Git site/ [html] (git-scm.com)
Pro Git book, written by Scott Chacon and Ben Straub [pdf] (git-scm.com)
Official Git tutorial [html] (kernel.org)
Everyday GIT With 20 Commands Or So [html] (kernel.org)
Git User’s Manual (for version 1.5.3 or newer) [html] (kernel.org)
Start using Git on the command line [html] (gitlab.com)

Official website: git-scm.com

Gmail W ^

Gmail Shortcuts [html] (evhead.com)

Official website: gmail.com

Go (Golang) W ^

Cheat sheets:

Go cheatsheet [html] (devhints.io)
Go Cheat Sheet by a8m [html, odt, pdf] (github.com/a8m/)
tldr go [html] (cheat-sheets.org). See also: tldr go *
Awesome Golang Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Documentation, Books, Articles:

A tour of Go [html] (tour.golang.org)
Golang wiki [html] (github.com/golang/go/)
Awesome Go [html] (awesome-go.com)
Go by Example by @mmcgrana [html] (gobyexample.com)
Effective Go [html] (golang.org)
JustForFunc: Programming in Go by Francesc Campoy [video] (youtube.com)
Go Code Review Comments (Style Guide) [html] (github.com/golang/go/)
Your basic Go by Stefan [html] (yourbasic.org/golang/)

Official website: golang.org

Google W ^

Google Help : Cheat Sheet [html] (google.com)
GoogleGuide [html] (googleguide.com)
Google Cheat Sheets [pdf, png:page1, png:page2]
PhD in Googling [html] (onlinephd.org)

Official website: http://www.google.com/

See also: Gmail, Google Chrome, Google Maps

Google App Engine W ^

Google App Engine for Java by Marko Grönroos [pdf] (dzone.com)
Google App Engine Python SDK 1.2.2 [pdf]

Official website: appengine.google.com

Google Chrome W ^

ChromePlus Mouse Gestures CheatSheet by Jakob Krarup [jpg] (jake.dk)

Official websites: www.google.com/chrome/, code.google.com/chromium/, dev.chromium.org/

Google Maps W ^

Google Maps Cheat Sheet [pdf] (nabito.net)

Official website: maps.google.com

Grails W ^

Getting Started with Grails by Dave Klein [pdf] (dzone.com)

Official website: grails.org

See also: Java

Griffon W ^

Getting Started with Griffon by Hamlet D’Arcy [pdf] (dzone.com)

Official website: griffon.codehaus.org

See also: Java

Groovy W ^

Groovy by Dierk König [pdf] (dzone.com)

Official website: groovy.codehaus.org

See also: Java

Guitar W ^

Tom's Guitar Cheat Sheet [gif, pdf] (halfhill.com)

GWT - Google Web Toolkit W ^

GWT: Style, Configuration and JSNI Reference by Robert Hanson [pdf] (dzone.com)

Official website: gwtproject.org

See also: AJAX, Google, Java, JavaScript

HAProxy W ^

Cheat sheets: HAProxy® Configuration Reference Card – version 1.0 by Zenetys [pdf] (zenetys.com) HAProxy® Troubleshooting Reference Card – version 1.0 by Zenetys [pdf] (zenetys.com)	Documentation, Books, Articles: HAProxy version 2.2.7 - Starter Guide [html] (cbonte.github.io) HAProxy version 2.2.7 - Configuration Manual [html] (cbonte.github.io) HAProxy version 2.2.7 - Management Guide [html] (cbonte.github.io)
Official website: haproxy.org Blog: haproxy.com/blog/

Hardware W ^

Computer hardware poster 1.7 by =Sonic840 [png] (sonic84.com)

Hadoop W ^

Getting Started with Apache Hadoop by Eugene Ciurana and Masoud Kalali [pdf] (dzone.com)
Apache Hadoop Deployment: A Blueprint for Reliable Distributed Computing by Eugene Ciurana [pdf] (dzone.com)

Official website: http://hadoop.apache.org/

See also: Apache

Haskell W ^

Haskell Cheat Sheet by Justin Bailey [pdf]
Haskell cheat sheet by Wincent Colaiuta [pdf] (rails.wincent.com)
Haskell Cheat Sheet by Scott Turner [pdf] (pkturner.org)
Haskell Cheat Sheet by Christopher Maneu [pdf] (maneu.fr | c-maneu.developpez.com)

Official website: http://haskell.org/

HBase W ^

Apache HBase: The NoSQL Database for Hadoop and Big Data by Alex Baranau and Otis Gospodnetic [pdf] (dzone.com)

Official website: hbase.apache.org

See also: Apache

Hibernate W ^

Getting Started with Hibernate Search by John Griffin [pdf] (dzone.com)

Official website: hibernate.org

See also: Java

.htaccess W ^

htaccess Cheatsheet [html] (thejackol.com)
.htaccess Cheat Sheet by Steve [html] (htaccesscheatsheet.com)

HTML - HyperText Markup Language W ^

HTML/XTML in one page [html] (html.su)
HTML 5 Cheat Sheet by Jamie Spencer [html, jpg, pdf] (makeawebsitehub.com)
HTML quick reference by Ian Graham [pdf] (tiger.la.asu.edu)
CDBurnerXP - XHTML Cheat Sheet in PDF format [pdf] (albany.edu)
HTML5 Canvas Cheat Sheet [pdf, png] (nihilogic.dk)
HTML Cheat Sheet by Dave Child [png, pdf] (addedbytes.com)
HTML & XHTML Tag Quick Reference [pdf] (albany.edu)
HTML5 Cheat Sheet by Bryan / ReviewBox [png and pdf, spanish (latin america) jpg and pdf] (hostingreviewbox.com)
HTML5 Cheat Sheet by Robert Mening [png, pdf] (websitesetup.org)
The Ultimate HTML 5 Cheat Sheet – 2021 (an easy-to-use HTML 5 cheat sheet for beginners) [jpg, pdf] (wpkube.com)
HTML5: The Evolution of Web Standards by James Sugrue [pdf] (dzone.com)
Core HTML by Andy Harris [pdf] (dzone.com)
HTML 5 Canvas A Web Standard for Dynamic Graphics by Simon Sarris [pdf] (dzone.com)
HTML5 WebSocket: Full-duplex, Real-time Web Communication by Peter Lubbers [pdf] (dzone.com)
HTML Cheat Sheet (For Beginners) by [pdf] (hostingfacts.com)
HTML Cheat Sheet + Free PDF Download by Matt Banner [jpg, pdf] (onblastblog.com)
Ultimate HTML Cheatsheet by Matt Ahlgren [png, pdf] (websitehostingrating.com)
HTML Cheat Sheet [html] (psacake.com)
(X)HTML Elements and Attributes [html] (cookwood.com)
HTML Tags a free online cheatsheet by VisiBone [html] (html-tags.info)
HTML & XHTML CheatSheet [html] (petefreitag.com)
HTML Cheat Sheet: A list of common HTML codes and their purpose. [html] (angelfire.com)
The Funky Useful HTML Cheat Sheet [html] (webhostingsearch.com)
HTML Cheat Sheet by Robert Duncan [html] (simplehtmlguide.com)
HTML CODES CHEAT SHEET [html] (killersites.com)
Awesome HTML5 Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: http://www.w3.org/html/

See also: Characters, CSS, JavaScript, Open Graph, XHTML.

HTTP - Hypertext Transfer Protocol W ^

HTTP/1.1 Status Codes by Bryan English [html] (bluelinecity.com)

Illustrator W ^

Illustrator CC 2015 by Ton Haarmans [pdf] (wideopenwindows.be)
Adobe Illustrator CS5 (Engels > Nederlands + sneltoetsen; Mac | Win) by Ton Haarmans [html] (wideopenwin.com)

Official website: http://www.adobe.com/products/illustrator/

See also: Adobe Systems, InDesign, Photoshop, Gimp

Image W ^

Image Formats Cheat Sheet – All you need to know about JPEGs, TIFFS, GIFs, PNGs & BMPs by Jamie Spencer [html, jpg] ()

InDesign W ^

InDesign CC 2015 by Ton Haarmans [pdf] (wideopenwindows.be)
Official website: adobe.com/products/indesign.html See also: Adobe Systems, Illustrator, Photoshop

Inkscape W ^

Inkscape keys (keyboard) and mouse reference [html] (inkscape.org)

Official website: inkscape.org

IntelliJ IDEA W ^

IntelliJ IDEA by Hamlet D’Arcy [pdf] (dzone.com)

Official website: jetbrains.com/idea/

See also: Java

International Phonetic Alphabet W

The official chart of the International Phonetic Alphabet (IPA), revised in 2020 by International Phonetic Association [svg] (wikimedia.org)

Official website: internationalphoneticassociation.org

IRC - Internet Relay Chat W ^

wikiHow:IRC Cheat Sheet [html, pdf] (wikihow.com)

Java W ^

Core Java by Cay S. Horstmann [pdf] (dzone.com)
Java 1.5 Cheat Sheet [html] (petefreitag.com)
JAVA Language Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)
JAVA Programming Guide - Quick Reference by Pinnacle Software Solutions [pdf] (digilife.be)
SAX 2.0 for Java (Core) by deepx [pdf] (digilife.be)
SAX 2.0 for Java (Extensions and Helpers) by deepx [pdf] (digilife.be)
Java Quick Reference [pdf] (digilife.be)
Java cheat sheet for C++ programmers by Erich Kaltofen [html] (www4.ncsu.edu/%7Ekaltofen/)
Core Java Concurrency by Alex Miller [pdf] (dzone.com)
Using XML in Java by Masoud Kalali [pdf] (dzone.com)
Getting Started with Java GUI Development by James Sugrue [pdf] (dzone.com)
tldr java [html] (cheat-sheets.org). See also:tldr *java*
Awesome Java Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Documentation, Books, Articles:

Java SE 6 Documentation [html] (oracle.com)

Official website: www.oracle.com/technetwork/java/

See also: Eclipse, EJB, GlassFish, Grails, GWT, Hibernate, IntelliJ IDEA, Java Persistence API, Java EE, JavaServer Faces, JBoss, JDBC, JSP, JUnit, Maven, NetBeans, RichFaces, Spring Framework, Spring Roo, Tapestry

Java HotSpot Virtual Machine W ^

Java HotSpot VM Options by Oracle [pdf] (oracle.com)

Official website: openjdk.java.net/groups/hotspot/

Java EE - Java Platform, Enterprise Edition W ^

Cheat sheets: Getting Started with Java EE Security by Masoud Kalali [pdf] (dzone.com) Contexts and Dependency Injection for the Java EE Platform by Norman Richards [pdf] (dzone.com) Java Enterprise Edition 6: The Most Elegant Enterprise Java Yet by Andrew Lee Rubinger [pdf] (dzone.com)	Documentation, Books, Articles: JavaTM Platform, Enterprise Edition 6 API Specification [html] (oracle.com)
Official website: http://www.oracle.com/technetwork/java/javaee/ See also: Java

Java Persistence API (JPA) W ^

Getting Started with JPA by Mike Keith [pdf] (dzone.com)
What's New in JPA 2.0 by Mike Keith [pdf] (dzone.com)
EclipseLink JPA: An Advanced ORM Persistence Framework by Gordon Yorke [pdf] (dzone.com)

See also: Java

JavaScript W ^

JavaScript in one page [html] (javascript.su)
JavaScript Cheat Sheet by Dave Child [html, png, pdf] (cheatography.com)
JavaScript a free online quick reference by VisiBone [html] (javascript-reference.info)
JavaScript Quick Reference Card [pdf] (explainth.at)
JavaScript and Browser Objects Quick Reference [html] (javascript-reference.info)
Regular Expressions for client-side JavaScript a free online quick reference by VisiBone [html] (visibone.com)
JavaScript language a- z cheat sheet by Alex Staveley [pdf] (dublintech.blogspot.com)
Javascript Cheat Sheet by Nick Schäferhoff [html, pdf] (websitesetup.org)
165+ JavaScript terms you need to know by Sachin Samal [html] (opensource.com)
Awesome JavaScript Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: http://developer.mozilla.org/en/docs/JavaScript

See also: AJAX, CSS, DOM, GWT, HTML, jQuery, MooTools, Node.js, Prototype, TypeScript, XHTML

JavaServer Faces (JSF) W ^

JavaServer Faces by Cay S. Horstmann [pdf] (dzone.com)
JavaServer Faces 2.0 by Cay Horstmann [pdf] (dzone.com)

JBoss W ^

Getting Started with JBoss Enterprise Application Platform 5 by Scott Marlow, Jaikiran Pai, Shelly McGowan, Brian Stansberry, and Len DiMaggio [pdf] (dzone.com)

Official website: http://www.jboss.com/products/platforms/application/

See also: Java

JDBC - Java Database Connectivity W ^

JDBC Best Practices by Jesse Davis [pdf] (dzone.com)

See also: Java

Jetty W ^

Jetty: A Lightweight, Open-Source Web Server and Servlet Container by Jos Dirksen [pdf] (dzone.com)

Official website: www.eclipse.org/jetty/, jetty.codehaus.org/jetty/

jQuery W ^

The jQuery Mega Cheat Sheet 2015 by Jamie Spencer [html, jpg] (makeawebsitehub.com)
jQuery 1.5 Visual Cheat Sheet by Antonio Lupetti [pdf] (woorkup.com)
jQuery 1.3 Visual Cheat Sheet by Antonio Lupetti (WOORK) [pdf] (woork.blogspot.com)
Beginner’s essential jQuery Cheat Sheet by Robert Mening [pdf, png] (websitesetup.org)
jQuery 1.2 Cheat Sheet [pdf, png, bw pdf, bw png] (labs.colorcharge.com)
jQuery 1.2 by Adrien Gibrat [pdf]
jQuery Selectors by Bear Bibeault & Yehuda Katz [pdf] (dzone.com)

See also: AJAX, CSS, DOM, HTML, JavaScript, Prototype, XHTML

JSP - JavaServer Pages W ^

JSP™ SYNTAX version 2.0 [pdf] (java.sun.com)
JSP Quick Reference Card [pdf] (adobe.com)
JSP Syntax [pdf] (digilife.be)
JSP Quick Reference Card [pdf] (digilife.be)
Essential JSP Expression Language by Bear Bibeault [pdf] (dzone.com)

Official website: http://java.sun.com/products/jsp/

See also: Java

JUnit W ^

JUnit Quick Reference by Delphi Consultants [pdf] (digilife.be)
JUnit and EasyMock by Michael T Minella [pdf] (dzone.com)

Official website: junit.org

See also: Java

Julia W ^

The Fast Track to Julia / A quick and dirty overview of Julia by Freepik [pdf] (juliadocs.github.io)
Julia Reference Card by John Lynch [pdf, odt] (github.com)
Julia Colors by John Lynch [odt] (github.com)
tldr julia [html] (cheat-sheets.org)

Official website: julialang.org

Kotlin W

Kotlin Cheat Sheet by Kt. Academy [pdf] (kt.academy)
Kotlin cheatsheet [html] (devhints.io)
Kotlin Cheat Sheet by Kt. Academy [png] (blog.kotlin-academy.com)
Kotlin Programming Language Cheat Sheet Part 1 by Dody Gunawinata (dodyg) [html] (gist.github.com)
tldr kotlin [html] (cheat-sheets.org)
tldr kotlinc [html] (cheat-sheets.org)

Official website: kotlinlang.org

Kubernetes W ^

kubectl Cheat Sheet [html] (kubernetes.io)
Awesome Kubernetes Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: kubernetes.io

Languages W ^

Codes for the Representation of Names of Languages (alpha-3/ISO 639-2, alpha-2/ISO 639-1) [html] (loc.gov)

LaTeX W ^

Latex cheat sheet by Winston Chang [pdf, ps, tex, png:page1, png:page2] (www.stdout.org/~winston/)
LaTeX cheat sheet by Dave Richeson [pdf] (divisbyzero.com)
AMS-LaTeX Reference Card by Joseph H. Silverman [pdf, dvi, TeX source] (math.brown.edu/~jhs/)

Official website: http://www.latex-project.org/

LaTeX-Suite (aka Vim-LaTeX)

LatexSuite Reference Card by Michael Goerz [pdf, tex] (users.physik.fu-berlin.de/~goerz/)

Official website: vim-latex.sourceforge.net/

less W ^

less cheat sheet by Mischa Poslawsky [html] (shiar.nl)
less tldr page [html] (cheat-sheets.org)

Linux W ^

TLDR Pages [html] (cheat-sheets.org)
Most used commands [html] (cheat-sheets.org)
Linux Command Line Tips [html] (pixelbeat.org)
Linux Shortcuts and Commands [html] (linuxshortcuts.shtml)
Unix/Linux Command Cheat Sheet by Jacob [pdf] (fosswire.net)
The One Page Linux Manual by Squadron [pdf] (homepage.powerup.com.au/~squadron/, digilife.be)
Linux Administrator's Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)
Linux System Calls Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)
Linux Security Quick Reference by Dave Wreski & Benjamin Thomas [pdf] (tiger.la.asu.edu, digilife.be)
Command Line Interface Commands [jpg]
A very brief guide to Linux by C. J. Rennie [html] (www.physics.usyd.edu.au/~rennie/)
Linux Tutorial - Cheat Sheet by Ryan Chadwick [html] (ryanstutorials.net)
Unix/Linux Command Reference [jpg] (makeuseof.com)
Linux Commands Cheat Sheet in Black & White by Bobbin Zachariah [pdf] (linoxide.com)
[Linux|CLI|Ubuntu] Command line cheat sheet by Patrick Kerwood [gif] (linuxbloggen.dk)
Linux Command Line Cheat Sheet by DaveChild [pdf] (cheatography.com)
Linux Cheatsheet by Muppix [html, pdf] (muppix.co)
Basic Linux Commands by Muppix [html, pdf] (muppix.co)
Linux Essential Terminal Commands by Muppix [html, pdf] (muppix.co)
Linux Commands Cheat Sheet by Hitesh Jethva [html] (pcwdld.com)
Linux Shell Commands by Cardiff School of Computer Science & Informatics [html] (docs.cs.cf.ac.uk)

See also: chmod, Debian, Fedora, Red Hat, Ubuntu, Unix

Lisp W ^

Common Lisp Quick Reference by Bert Burgemeister [pdf: a4 booklet all, a4 booklet four, a4 consec, letter booklet all, letter booklet four, letter consec; tar.gz (LaTeX source)] (clqr.boundp.org)

Logic W ^

Logic gate [html] (wikipedia.org)
logic gate [html] (techtarget.com)

Lotus Domino W ^

Lotus Domino URL sheet (Domino URL cheat sheet) by Tara Hall [html] (ibm.com)
Lotus Domino Search commands (Searching via Domino URL commands) by Bruno Grange and Kevin Giles [html] (lotus.com)

Official website: ibm.com/software/lotus/products/domino/

Lua W ^

Cheat sheets, reference cards, reference sheets, crib sheets:

Lua 5.1 C API short reference (lists all the calls along with a short description of the parameters) by Ewald Arnold [odt, pdf] (aewald-arnold.de)
Lua 5.1 C API short reference (lists all the calls with even shorter descriptions but also includes the stack layout of the ingoing and outcoming Lua values) by Ewald Arnold [xls, pdf] (aewald-arnold.de)
Lua - Beginners Guide by Rogério Rodrigues de Alcântara (@roalcantara) [html/md] (gist.github.com)
tldr lua [html] (cheat-sheets.org)

Documentation, books, articles:

A guide to Lua: Learn Lua with this downloadable eBook by Seth Kenlon, CC BY-SA 4.0) [pdf, epub] (opensource.com)
Lua Programming [html] (en.wikibooks.org)
Lua/Tutorial [html] (mediawiki.org)

Official website: lua.org

Lucene W ^

Cheat sheets, reference cards, reference sheets, crib sheets:

Understanding Lucene (Powering Better Search Results) by Erik Hatcher [pdf] (dzone.com)

Documentation, books, articles:

Official Documentation [html] (lucene.apache.org)

Official website: lucene.apache.org

Mac, Macintosh W ^

Mac-friendly Terminal Cheat Sheet [pdf] (alexyoung.org)

Mac OS X W ^

The OS X Keyboard Cheat Sheet by Amduus Information Works, Inc. [pdf] (amduus.com)
Apple Mac OS X Terminal Commands list [pdf] (scribd.com)

Official website: apple.com/macosx/

Machine LearningW ^

Big Data Machine Learning: Patterns for Predictive Analytics by Ricky Ho [pdf] (dzone.com)

Maple W ^

Maple 11 Cheat Sheet by Margaret Yau. Mt. San Antonio College [pdf] (math.mtsac.edu)

Official website: maplesoft.com/products/maple/

See also: Math, Mathematica, MATLAB, Maxima, PARI/GP, SageMath.

Markdown (CommonMark) W ^

Markdown Syntax [pdf] (github.com)
Markdown Cheat Sheet (A quick reference to the Markdown syntax) by Matt Cone [html] (markdownguide.org)
Markdown Cheatsheet by Adam Pritchard [html] (github.com)
Markdown cheat sheet by PaperHive UG [html] (paperhive.org)
Markdown Cheat Sheet by Zoho Corporation Pvt. Ltd [html] (site24x7.com)
The Ultimate Markdown Cheat Sheet by Mahbub Zaman [html] (towardsdatascience.com)
Markdown cheat sheet [html] (warpedvisions.org)
Markdown: Syntax [html] (daringfireball.net)

Official website: daringfireball.net/projects/markdown/

CommonMark: commonmark.org/

CommonMark Spec: spec.commonmark.org/

Math, Mathematics W ^

Mathematical Symbols [html] (techtarget.com)
Table of Laplace Transforms W ^ by Paul Dawkins [pdf, html] (tutorial.math.lamar.edu)
MATH CHEAT SHEET by Cliff Notes [pdf] (onestopgre.com)
MATH 1401 SPRING 2000 CHEAT SHEET FINAL by JAN MANDEL [pdf]
Mathematics Cheat Sheet for Population Biology by James Holland Jones [pdf] (stanford.edu/~jhj1/)
Useful Inequalities W ^ by Laszlo Kozma [pdf, ps.gz] (lkozma.net)

Tools: WolframAlpha

See also: Algebra, Calculus, Computer Science, Geometry, LaTeX, Maple, Mathematica, Mathomatic, MathML, MATLAB, Maxima, PARI/GP, Probability Theory, SageMath, Statistics, Trigonometry

Mathematica W ^

Just Enough Mathematica to Make you Dangerous by Joe St Sauver, Ph.D. [pdf] (uoregon.edu/~joe/)

Official website: wolfram.com/products/mathematica/

See also: Maple, Math, Mathomatic, MATLAB, Maxima, PARI/GP, SageMath.

MathML - Mathematical Markup Language W ^

MathML in one page [xhtml+mathml]
MathML: elements - attributes [pdf] (zvon.org)

Official website: w3.org/Math/

See also: XHTML, XML, XML Schema, XPath XSL, XSLT

Mathomatic W ^

Mathomatic Quick Reference Sheet by George Gesslein II [pdf] (mathomatic.org)
Mathomatic Quick Reference Card by George Gesslein II and John Blommers [pdf] (mathomatic.org)

Official website: www.mathomatic.org

See also: Algebra, Math, Mathematica, Maxima, PARI/GP, SageMath.

MATLAB W ^

Matlab Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)
Matlab toolboxes Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)
A Matlab Cheat-sheet (MIT 18.06, Fall 2007) [pdf] (mit.edu)

Official website: mathworks.com/products/matlab/

See also: Maple, Math, Mathematica, Maxima, PARI/GP, SageMath.

Maven (Apache Maven) W ^

Apache Maven 2 by Matthew McCullough [pdf] (dzone.com)
Getting Started with Maven Repository Management by Jason Van Zyl [pdf] (dzone.com)

Official website: maven.apache.org

Maxima W ^

A 10 minute tutorial for solving Math problems with Maxima by Antonio Cangiano [html, pdf] (math-blog.com)

Official website: maxima.sourceforge.net

See also: Maple, Math, MATLAB, Mathematica, Mathomatic, PARI/GP, SageMath.

MFC - Microsoft Foundation Class Library W ^

Microsoft Foundation Class Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)

Microformats W ^

Microformats Cheat Sheet by Dave Child [html] (cheatography.com)
Microformats Cheat Sheet [pdf] (suda.co.uk)

Official website: http://microformats.org/

Microsoft Excel - Microsoft Office Excel and VBA - Visual Basic for Applications W ^

Excel III Cheat Sheet - Microsoft Excel XP/2003, Level 300 by SHARED COMPUTING SERVICES [pdf] (scs.unl.edu)
Excel VBA Programming Functions [pdf] (cheat-sheets.org)

Official website: office.microsoft.com/en-us/excel/

See also: Microsoft Office, Microsoft Project (MSP), Microsoft Visual Studio

Microsoft Office W ^

Quick Reference for Math in Microsoft Office by Hugues Hoppe [pdf, docx] (research.microsoft.com/~hoppe/)

Official website: www.office.com

See also: Microsoft Excel, Microsoft Project (MSP), Microsoft Visual Studio

Microsoft Project (MSP) W ^

Microsoft Project 2007 Quick Reference Card by CustomGuide [pdf] (customguide.com)

Official website: office.microsoft.com/en-us/project/

See also: Microsoft Excel, Microsoft Office, Microsoft Visual Studio

Microsoft Visual Studio W ^

Getting Started with Visual Studio 2010 by Alessandro Del Sole [pdf] (dzone.com)

Official website: http://www.microsoft.com/visualstudio

See also: Microsoft Excel, Microsoft Office, Microsoft Project (MSP)

MIME - Multipurpose Internet Mail Extensions W ^

IANA MIME Media Types [html] (iana.org)

mod_perl W ^

Mod_perl Quick Reference Card by Andrew Ford [pdf] (refcards.com)

Official website: http://perl.apache.org/

mod_rewrite W ^

mod_rewrite Cheat Sheet by Dave Child [html, png, pdf] (cheatography.com)

MooTools W ^

mootools 1.3 cheat sheet [pdf] (mediavrog.net)
mootools 1.2 cheat sheet [pdf] (mediavrog.net)

Official website: http://mootools.net/

Mozilla Thunderbird W ^

MOZILLA THUNDERBIRD CHEAT SHEET by David Tenser [pdf] (mozilla.com)

Official website: mozilla.com/thunderbird/

Mule W ^

Core Mule by Jos Dirksen [pdf] (dzone.com)

Official website: mulesoft.org

Music W ^

Dan’s Music Theory 101 Cheat Sheet by Dan Goodspeed [pdf] (tutorial.math.lamar.edu)

Tools: WolframAlpha

MVVM (Model View ViewModel) W ^

The MVVM Design Pattern: A Formula for Elegant, Maintainable Mobile Apps by Colin Melia [pdf] (dzone.com)

MySQL W ^

SQL (Structured Query Language) in one page by Alexander Krassotkin [html] (cheat-sheets.org)
MySQL Cheat Sheet by Dave Child [html, png, pdf] (cheatography.com)
MySQL cheatsheets by Bob Stein, VisiBone [two wall posters 43cmx61cm or 61cmx87cm, jpg] (visibone.com)
MySQL Cheat Sheet [html] (nparikh.org)
MySQL Database Quick Reference by DeepX [pdf] (deepX.com)
MySQL Cheat Sheet: Complete Cheat Sheet by Nick Schäferhoff (Editor in Chief) [pdf, webp] (websitesetup.org)
Essential MySQL by W. Jason Gilmore [pdf] (dzone.com)
Database Partitioning with MySQL: Improving Performance, Availability, and Manageability by Narayana Maruvada [pdf] (dzone.com)
Awesome MySQL Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: mysql.com

See also: DB2, Oracle, PostgreSQL, SQL, SQLite, Sybase

NanoW ^

Nano Cheat Sheet by Hans Van Slooten [pdf]
tldr nano [html] (cheat-sheets.org)

Official website: nano-editor.org

NetBeans W ^

Cheat sheets:

NetBeans Platform 7.0: A Framework for Building Pluggable Enterprise Applications by Heiko Böck, Anton Epple, Miloš Šilhánek, Andreas Stefik, Geertjan Wielenga, and Tom Wheeler [pdf] (dzone.com)
Essential NetBeans Platform by Heiko Böck, Anton Epple, Miloš Šilhánek, Andreas Stefik, Geertjan Wielenga, and Tom Wheeler [pdf] (dzone.com)
NetBeans Java Editor by Geertjan Wielenga and Patrick Keegan [pdf] (dzone.com)

Documentation, Books, Articles:

NetBeans Tutorials and Articles [html] (netbeans.org)

Official website: netbeans.org

Neural NetworkW ^

An informative chart to build Neural Network Cells by Fjodor van Veen [png] (asimovinstitute.org)
An informative chart to build Neural Network Graphs by Fjodor van Veen [png] (asimovinstitute.org)
A Mostly Complete Chart of Neural Networks by Fjodor van Veen [png] (asimovinstitute.org)

Node.js W ^

Node.js: Building for Scalability with Server-Side JavaScript by Todd Eichel [pdf] (dzone.com)
tldr npm [html] (cheat-sheets.org)

Official website: nodejs.org

Notepad++ W ^

Notepad++ cheat sheet by Andres Gomez [pdf] (docs.google.com)

Official website: notepad-plus-plus.org

Nginx W

Awesome Nginx Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: nginx.org

NMAP W ^

Cheat sheet:

NMAP quick reference by Alejandro Ramos [pdf (eng), pdf (esp)] (SecurityByDefault.com)

Official website: nmap.org

Numbers W ^

Hexadecimal Chart [html] (cookwood.com)

Objective-C W ^

Objective-C for the iPhone and iPad by Ben Ellingson and Matthew McCullough [pdf] (dzone.com)

Official website: developer.apple.com/.../introObjectiveC.html

See also: C, C#, C++, Cocoa, Mac, Mac OS X

The Open Graph protocol (og:)


Official website: ogp.me See also: HTML

OpenCL W ^

OpenCL API 1.2 Reference Card by Khronos Group [pdf] (khronos.org)
OpenCLTM API 1.0 Quick Reference Card by Khronos Group [pdf] (khronos.org)

Official website: http://www.khronos.org/opencl/

OpenCV W ^

OpenCV 2.1 Cheat Sheet (C++) [pdf] (opencv.willowgarage.com)

Official website: http://opencv.org/

OpenMP (Open Multi-Processing) W ^

OpenMP Reference Sheet for C/C++ [pdf] (plutospin.com)

Official website: http://openmp.org/

OpenSearch W ^

OpenSearch Cheat Sheet by Gareth J M Saunders [pdf] (garethjmsaunders.co.uk)

Official website: http://www.opensearch.org/

OpenSCAD W ^

OpenSCAD CheatSheet [html] (openscad.org)

Official website: http://www.openscad.org/

OpenSSH - OpenBSD Secure Shell W ^

OpenSSH Configuration Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)

Official website: http://www.openssh.org/

OpenVZ - Open operating system-level virtualization W ^

OpenVZ Cheatsheet by Jesse Keys [pdf] (teh.geekosphere.org)

Official website: http://openvz.org/

Oracle W ^

Oracle PL/SQL Cheatsheet [html] (yagc.ndo.co.uk)
Oracle Relational SQL Cheatsheet [html] (yagc.ndo.co.uk)
Oracle Cheat Sheet [html] (vttoth.com)
Oracle SQL quick reference by EM Group [pdf] (tiger.la.asu.edu)
Oracle Server Architecture by Dr. Lars Ditzel [pdf] (digilife.be)
ORACLE Server 8i Quick Reference Card by Dr. Lars Ditzel [pdf] (digilife.be)
Oracle Server 9i - Quick Reference Guide [pdf] (digilife.be)

Official website: oracle.com

See also: DB2, MySQL, PostgreSQL, SQL, SQLite, Sybase

org-mode W ^

Org-Mode Reference Card by Philip Rooke [pdf] (perforce.com)
$ cheat orgmode - Org-Mode Reference Card by by Camping, Heroku and, to a lesser extent, GitHub [html] (cheat.errtheblog.com)
Org-mode cheat sheet (russian) by vitya borisov [pdf]

Official website: orgmode.org

PARI/GP W ^

Cheat sheets:

Basic GP: Pari-GP reference card by K. Belabas based on an earlier version by Joseph H. Silverman [pdf] (pari.math.u-bordeaux.fr)
Number Fields: Algebraic Number Theory by K. Belabas based on an earlier version by Joseph H. Silverman [pdf] (pari.math.u-bordeaux.fr)
Elliptic Curves by K. Belabas based on an earlier version by Joseph H. Silverman [pdf] (pari.math.u-bordeaux.fr)
L-functions by K. Belabas based on an earlier version by Joseph H. Silverman [pdf] (pari.math.u-bordeaux.fr)
Modular forms and modular symbols by K. Belabas based on an earlier version by Joseph H. Silverman [pdf] (pari.math.u-bordeaux.fr)

Documentation, Books, Articles:

Online User's Guide: This is an html documentation of functions available under the PARI/GP calculator by PARI/GP team [html.tgz] (pari.math.u-bordeaux.fr)
GNU Readline Library by PARI/GP team [html] (pari.math.u-bordeaux.fr)
Users' Guide to PARI/GP by The PARI Group [pdf] (pari.math.u-bordeaux.fr)
Users' Guide to the PARI library by The PARI Group [pdf] (pari.math.u-bordeaux.fr)
Developer's Guide to the PARI library by The PARI Group [pdf] (pari.math.u-bordeaux.fr)
Installation Guide by The PARI Group [pdf] (pari.math.u-bordeaux.fr)
GP Tutorial by The PARI Group [pdf] (pari.math.u-bordeaux.fr)
Tutorial for modular forms by Henri Cohen [pdf] (pari.math.u-bordeaux.fr)
Introduction to parallel GP by The PARI Group [pdf] (pari.math.u-bordeaux.fr)

Official website: pari.math.u-bordeaux.fr

See also: Algebra, Maple, Math, Mathematica, MATLAB, Mathomatic, Maxima, SageMath.

Perforce W ^

P4V Cheat Sheet [pdf] (perforce.com)

Official website: perforce.com

Perl W ^

perlcheat - Perl 5 Cheat Sheet by [html] (perldoc.perl.org)
perlcheat (5.8.7) - Perl 5 Cheat Sheet [html] (cpan.org)
Perl Cheat Sheet [html] (juerd.nl)
Perl Quick Reference Card [pdf] (johnbokma.com)
Perl Regular Expressions by Iain Truskett [pdf] (refcards.com)
Perl Regular Expression - Quick Reference [pdf]
Perl Predefined Variables (perl's special variable cheat sheet) by Peteris Krumins [doc, pdf] (catonmat.net)
Perl pack/unpack Summary (perl's pack/unpack and printf cheat sheet) by Peteris Krumins [doc, pdf] (catonmat.net)
Perl Scripting Language Quick Reference by Johan Vromans [pdf] (tiger.la.asu.edu)
PERL Win32 Quick Reference by Jialong He [pdf] (digilife.be)
Perl Reference Card by Michael Goerz [pdf, odt] (users.physik.fu-berlin.de/~goerz/)
Perl Cheat Sheet by Hitesh Jethva (Hitesh J) [html] (pcwdld.com)

Official website: http://www.perl.org/

Photoshop W ^

Photoshop 7.0 Quick Reference Card for Windows [pdf] (frenchfragfactory.net)
Photoshop CS2 Keyboard Shortcuts (Windows) [pdf] (creativetechs.com)
Photoshop CS2 Keyboard Shortcuts (Macintosh) [pdf] (creativetechs.com)
Handy Photoshop Toolbox Reference Guide [html] (simplephotoshop.com)
Photoshop CC 2015 by Ton Haarmans [pdf] (wideopenwindows.be)
Spiekbrief | Adobe Photoshop CS6 | Mac | PC by Ton Haarmans [html] (wideopenwin.com)
Adobe Photoshop CS5 | Engels > Nederlands + sneltoetsen (Mac | Win) by Ton Haarmans [html] (wideopenwin.com)
English to Dutch menu's and shortcuts for Photoshop CS4 (Mac | Win) by Ton Haarmans [html] (wideopenwin.com)
2015 Adobe Photoshop Keyboard Shortcuts Cheat Sheet by Jamie Spencer [html, jpg] (makeawebsitehub.com)

Official website: http://www.adobe.com/products/photoshop/

See also: Adobe Systems, Illustrator, InDesign, Gimp

PHP W ^

PHP Cheat Sheet by Dave Child [html, png, pdf] (cheatography.com)
The VisiBone PHP Skinny Sheet [8.5" x 11" (A4) size Laminated , gif] (visibone.com)
PHP 4 Quick Reference Card by Steven R. Gould [pdf, ps, tex] (stevengould.org)
PHP cheat sheet (Classes and objects, functions, output control, regex) by Daniel Dev [pdf, png]
Ultimate PHO Cheatsheet by Matt Ahlgren [png, pdf] (websitehostingrating.com)
PHP Cheat Sheet with special php syntax [html] (blueshoes.org)
PHP Variable Comparison, PHP Arithmetic Operations and PHP Variable Testing by Juliette Reinders Folmer [html] (phpcheatsheets.com)
Smarty cheat sheet for template designers [pdf, gif] (somewherein.net)
Adobe® ColdFusion Web Services for PHP Programmers by Marco Tabini [pdf] (dzone.com)
PHPUnit: PHP Test-Driven Development Automated Tools to Improve Your PHP Code Quality by Giorgio Sironi [pdf] (dzone.com)
Awesome Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: http://php.net/

See also: Doctrine, PHP Frameworks, Symfony

PHP Frameworks W ^

Kohana (O) CheatSheet by Adam Stankiewicz [html, png, jpg, pdf] (kohana.sher.pl)
Awesome Laravel Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)
Behat (O) Cheat Sheet by Jean-François Lépine [pdf] (blog.lepine.pro)

Physics W ^

Table of Physical Constants [html] (techtarget.com)
Table of Physical Units [html] (techtarget.com)
Physics Equations [pdf] (scribd.com)
Physical Science Final Exam Cheat Sheet: Energy, Power, Thermodynamics [pdf]

Tools: WolframAlpha

Play Framework W ^

Cheat sheets: Play! Framework Cheat Sheet [html] (playframework.org)	Documentation, Books, Articles: Official Documentation: Manual, tutorials & references [html] (playframework.org)
Official website: http://www.playframework.org/

PostgreSQL W ^

PostgreSQL [html] (petefreitag.com)
Lorenzo Alberton. PostgreSQL cheat sheet [gif, pdf, png] (alberton.info)
Essential PostgreSQL by Leo Hsu and Regina Obe [pdf] (dzone.com)

Official website: http://www.postgresql.org/

See also: DB2, MySQL, Oracle, SQL, SQLite, Sybase

Probability Theory W ^

Cheat Sheet for Probability Theory by Ingmar Land [pdf] (kom.aau.dk)

See also: Math

Prolog W

Prolog CheatSheet by Musa Al-hassy [pdf] (alhassy.github.io)
Cheatsheet Prolog [html] (programming-idioms.org)
PROLOG (PROgramming in LOGic) - Cheat Sheet by R. Odendahl [html] (www.cs.oswego.edu/~odendahl/)

Official website: iso.org/standard/21413.html, iso.org/standard/20775.html

Prototype W ^

Prototype Dissected [png: 1280x960 on Black, 1440x900 on Black, 1280x960 on White, 1440x900 on White] (snook.ca)

Official website: http://prototypejs.org/

Python W ^

Python Quick Reference Card by Laurent Pointal [odt, pdf] (laurent.pointal.org)
Python Cheat Sheet by Dave Child [png, pdf] (cheatography.com)
Python Quick Reference by Laurent Pointal [pdf] (laurent.pointal.org)
Python 3 Cheat Sheet by Laurent Pointal [pdf]
Python Beginner Cheat Sheet [pdf] (nostarch.com)
The Ultimate Python Cheat Sheet [pdf] (finxter.com)
Python Keywords Cheat Sheet [pdf] (finxter.com)
Python Cheat Sheet: Basic Data Types [pdf] (finxter.com)
Python Complex Data Types Cheat Sheet [pdf] (finxter.com)
Python List Methods Cheat Sheet [pdf] (finxter.com)
Python Set Methods Cheat Sheet [pdf] (finxter.com)
Python Object Orientation Terminology Cheat Sheet [pdf] (finxter.com)
Python Classes Cheat Sheet [pdf] (finxter.com)
Python Functions and Tricks Cheat Sheet [pdf] (finxter.com)
Python Interview Questions Cheat Sheet [pdf] (finxter.com)
Python NumPy Cheat Sheet [pdf] (finxter.com)
Python For Data Science Cheat Sheet: Python Basics [pdf] (datacamp.com)
Python 2.6 Quick Reference [html] (rgruet.free.fr)
Python 2.5 Reference Card by Michael Goerz [pdf, odt] (users.physik.fu-berlin.de/~goerz/)
Dataquest Data Science Cheat Sheet – Python Basics [pdf] (dataquest.io)
Dataquest Data Science Cheat Sheet – Intermediate [pdf] (dataquest.io)
Python Regular Expressions Data Science Cheat Sheet [pdf] (dataquest.io)
Data Science Cheat Sheet [pdf] (dataquest.io)
Python network programming cheat sheet by Tim Keary [jpg] (comparitech.com)
NumPy / SciPy / Pandas Cheat Sheet by [pdf] (quandl.com)
Awesome Python Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: http://www.python.org/

Qt W ^, Qt Creator W ^

Qt Creator reference card by KDAB [pdf] (kdab.com)

Official website: qt.nokia.com

Quarkus W ^

Quarkus Cheat-Sheet by @alexsotobJ [pdf] (lordofthejars.github.io) Getting Started With Quarkus by Alex Soto [pdf] (dzone.com)
Official website: quarkus.io

Quicksilver W ^

Quicksilver Quick Reference [pdf] (mysite.verizon.net/hmelman/)

Official website: blacktree.com

R W ^

R Reference Card by Tom Short [pdf] (cran.za.r-project.org)
R reference card by Jonathan Baron [pdf] (cran.za.r-project.org)
R Cheat Sheet by Quandl [pdf] (quandl.com)

Official website: r-project.org

Rebol W ^

REBOL Quick Reference Card by REBOL Technologies [html] (rebol.com)
Rebol examples by Nick Antonaccio [txt] (re-bol.com)

Official website: www.rebol.com

Red Hat W ^

RedHat/Fedora command cheat sheet [html] (jd40c.com)

Official website: redhat.com

Redis W

Awesome Redis Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: redis.io (github.com/redis)

Regular Expressions W ^

Regular Expressions Cheat Sheet [html, png, pdf] (cheatography.com)
Regular Expression Cheat Sheet (.NET) [html] (regexlib.com)

REST (Representational State Transfer) W ^

REST: Foundations of RESTful Architecture by Brian Sletten [pdf] (dzone.com)

RichFaces W ^

RichFaces 4.0: A Next Generation JSF Framework by Nick Belaevski, Ilya Shailkovsky, Max Katz, and Jay Balunas [pdf] (dzone.com)
JBoss RichFaces by Nick Belaevski, Ilya Shaikovsky, Jay Balunas, and Max Katz [pdf] (dzone.com)

Official website: jboss.org/richfaces/

See also: AJAX, Java, JavaServer Faces, Seam

rpm - Red Hat Package Manager W ^

rpm command cheat sheet for Linux [html] (cyberciti.biz)
RPM Cheat Sheet [html] (michal.guerquin.com)

Official website: http://www.rpm.org/

Ruby W ^

Ruby QuickRef [html] (zenspider.com)
Ruby Cheatsheet [pdf, png:page1, png:page2] (cenophobie.com)
Ruby Language QuickRef by Ryan Davis with Austin Ziegler [pdf] (digilife.be)
Ruby Library QuickRef by Ryan Davis with Austin Ziegler [pdf] (digilife.be)
Essential Ruby by Melchior Brislinger and Peter Cooper [pdf] (dzone.com)

Official website: ruby-lang.org

Ruby on Rails W ^

Ruby on Rails Cheat Sheet by Dave Child [png, pdf] (addedbytes.com)
RubyOnRails-Cheatsheet by Blaine Kendall [pdf] (blainekendall.com)
Ruby on Rails cheat sheet guide [pdf] (slash7.com)
What Goes Where a Ruby on Rails cheat sheet by Amy Hoy [pdf] (slash7.com)

Official website: rubyonrails.org

Rust W

Rust Language Cheat Sheet by Dr. Ralf Biedert [html, pdf] (cheats.rs)
Rust cheat sheet by Seth Kenlon [pdf] (opensource.com)
Rust cheatsheet by @Fechin [html] (quickref.me)
cheat sheet for rust language by @donbright [heml] (github.com/donbright)

Official website: rust-lang.org

SageMath (Sage, SAGE)W ^

Cheat sheets:

Sage Quick Reference by William Stein (based on work of P. Jipsen) [pdf] (wiki.sagemath.org)
Sage Quick Reference: Linear Algebra by Robert A. Beezer (Based on work by Peter Jipsen, William Stein) [pdf] (wiki.sagemath.org)
Sage Quick Reference: Elementary Number Theory by William Stein [pdf] (wiki.sagemath.org)
Sage Quick Reference: Calculus by William Stein [pdf] (wiki.sagemath.org)
Sage Quick Reference (Basic Math) by Peter Jipsen [pdf] (wiki.sagemath.org)
Sage Quick Reference: Graph Theory by Steven Rafael Turner [pdf] (wiki.sagemath.org)
Sage Quick Reference: Abstract Algebra by B. Balof, T. W. Judson, D. Perkinson, R. Potluri (based on work by P. Jipsen, W. Stein, R. Beezer) [pdf] (wiki.sagemath.org)
Sage Dynamics Ref Card v3.0 by B. Hutz, J. Silverman [pdf] (wiki.sagemath.org)
Sage Quick Reference Cards in different languages [html -> pdf] (wiki.sagemath.org)

Documentation, Books, Articles:

SageMath Help [html] (sagemath.org)
SageMath Documentation [html] (doc.sagemath.org)

Official website: sagemath.org

See also: Algebra, Maple, Math, Mathematica, MATLAB, Mathomatic, Maxima, PARI/GP.

Sandcastle W ^

Cheat sheets: Sandcastle and Sandcastle Help File Builder by Michael Sorens [pdf] (red-gate.com)	Documentation, Books, Articles: Taming Sandcastle: A .NET Programmer's Guide to Documenting Your Code by Michael Sorens [pdf] (red-gate.com)
Official websites: Sandcastle - sandcastle.codeplex.com Sandcastle Help File Builder (SHFB) - shfb.codeplex.com See also: .NET

Scala W ^

Scala Cheat Sheet [pdf] (geekontheloose.com)

Official website: scala-lang.org

Scalability W ^ and High Availability W ^

Scalability & High Availability by Eugene Ciurana [pdf] (dzone.com)
Getting Started with NoSQL and Data Scalability by Eugene Ciurana [pdf] (dzone.com)

Science W ^

See: Astronomy, Chemistry, Computer Science, Math, Physics

Screen - Screen VT100/ANSI Terminal Emulator W ^

Screen VT100/ANSI Terminal Emulator Cheat Sheet by Peteris Krumins [pdf, tex, txt] (catonmat.net)

Seam W ^

Core Seam by Jacob Orshalick [pdf] (dzone.com)
Seam UI by Jacob Orshalick [pdf] (dzone.com)

Official website: seamframework.org

Sed - Stream EDitor W ^

Sed Command Summary (sed cheat sheet) by Peteris Krumins [doc, pdf, txt] (catonmat.net)

Selenium W ^

Getting Started with Selenium by Frank Cohen [pdf] (dzone.com)
XPath, CSS, DOM and Selenium: The Rosetta Stone by Michael Sorens [pdf: Locators table, Locators groups] (simple-talk.com)

Official website: seleniumhq.org

Sendmail W ^

Sendmail Configuration Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)

Official website: http://www.sendmail.org/

ServiceMix (Apache ServiceMix) W ^

ServiceMix 4.2: The Apache Open Source ESB by Jos Dirksen [pdf] (dzone.com)

Official website: servicemix.apache.org

Shell script W ^ W ^

TLDR Pages [html] (cheat-sheets.org)
Most used commands [html] (cheat-sheets.org)
UNIX / Linux Shell Cheat Sheet by Steve Parker [pdf] (steve-parker.org)
SHELL PROGRAMMING QUICK REFERENCE GUIDE by Michael Oliveri [pdf] (mikeoliveri.com)
Bourne Shell Quick Reference Card by Hooman Baradaran [pdf] (hoomanb.com)
Unix/Linux shell script reference by Alvin Alexander [html] (alvinalexander.com)
Advanced Bash-Scripting Guide [pdf] (linuxtopia.org)
Awesome Bash Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)
Linux metacharacters cheat sheet by Seth Kenlon, David Both, Don Watkins / CC BY-SA 4.0 [pdf, txt] (opensource.com)

Social media W ^

2016 Social Media Image Sizes Cheat Sheet by Jamie Spencer [html, jpg] (makeawebsitehub.com)

Solaris W ^

Sun Solaris Administrator's Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)

Official website: sun.com/solaris/

Solidity W

Solidity v0.8.15 cheatsheet by Ethereum [html] (soliditylang.org)
Solidity Cheatsheet and Best practices by Manoj (manojpramesh) [html] (github.com)
Solidity Cheatsheet for version 0.4.25 by topmonks [html] (topmonks.github.io)

Official website: github.com/ethereum/solidity

Spring Framework W ^

Spring Web Flow W ^ by Craig Walls [pdf] (dzone.com) Spring Annotations by Craig Walls [pdf] (dzone.com) Getting Started with Spring-DM by Craig Walls [pdf] (dzone.com) Expression-Based Authorization with Spring Security 3 by Willie Wheeler [pdf] (dzone.com) Eclipse Tools for Spring: The SpringSource Tool Suite by Gordon Dickens, Chariot Solutions [pdf] (dzone.com)
Official website: springsource.org See also: Java, Spring Roo

Spring Roo W ^

Spring Roo: Open-Source Rapid Application Development for Java by Stefan Schmidt [pdf] (dzone.com)

Official website: www.springsource.org/roo

SQL - Structured Query Language W ^

SQL in one page [html] (sql.su)
SQL Cheatsheet [html] (3gwt.net)
SQL Cheat Sheet [pdf, gif] (sqltutorial.org)
SQL Cheat Sheet [pdf] (sql-tutorial.net)
SQL Tutorial - Learn SQL [html] (sql-tutorial.net)
SQL Commands by Muppix [html, pdf] (muppix.co)
SQL Injection Cheat Sheet [html] (netsparker.com)
SQL Injection Cheat Sheet [html] (invicti.com)
SQL Injection [html] (websec.ca)
SQL Injection [html] (hacktricks.xyz)

See also: DB2, MySQL, Oracle, PostgreSQL, SQL Server, SQLite, Sybase

SQL Server W ^

SQL Server Cheat Sheet by Dave Child [html, png, pdf] (cheatography.com)

Official website: http://www.microsoft.com/sql/

See also: DB2, MySQL, Oracle, PostgreSQL, SQL, SQLite, Sybase

SQLite W ^

Syntax Diagrams For SQLite [html] (sqlite.org)	Documentation, Books, Articles: Categorical Index Of SQLite Documents [html] (sqlite.org) SQLite In 5 Minutes Or Less [html] (sqlite.org)
Official website: http://www.sqlite.org/ See also: DB2, MySQL, Oracle, PostgreSQL, SQL, SQL Server, Sybase

SSI - Server Side Includes (mod_include) W ^

SSI in one page [html] (ssi.su)
Server Side Includes Quick Reference Card [pdf] (explainth.at)

Official website: httpd.apache.org/docs/2.2/mod/mod_include.html

See also: Apache

Statistics and Data Analysis W ^

Statistics Reference Cheatsheet: The Basic Principles Of Statistics For Introductory Courses [pdf] (scribd.com)
Statistics Cheat Sheet by Mr. Roth [pdf, doc] (docstoc.com)
Engineering Statistics Cheat Sheet #1 [pdf] (docstoc.com)

Tools: WolframAlpha

SVG - Scalable Vector Graphics W ^

SVG Visual Cheat Sheet by Alexander Krassotkin [html] (cheat-sheets.org)

Official website: w3.org/Graphics/SVG/

SVN (Apache Subversion) - version control system W ^

Subversion Cheat Sheet by Dave Child [html, pdf, png] (cheatography.com)
Subversion Cheat Sheet [html] (abbeyworkshop.com)
Subversion Quick Reference Card by Cezary Sobaniec [pdf]
Cheat Sheet Subversion by Lucas Baltes [pdf] (cs.put.poznan.pl)
Subversion® Quick Reference Card by collab.net [pdf] (collab.net)
Git for Subversion Users - A Cheat Sheet by Tobias Günther [pdf] (git-tower.com)

Official website: http://subversion.apache.org/

Swift W

Swift 5.1 Cheat Sheet and Quick Reference by Lorenzo Boaro [pdf] (raywenderlich.com)
Swift Cheat Sheet [html] (github.io)
Swift 5 Cheatsheet by Reinder de Vries (reinder42) [html] (github.com)
tldr swift [html] (cheat-sheets.org)

Official website: www.swift.org

Sybase W ^

Sybase SQL Server 11 [html] (selectorweb.com)

Official website: Sybase Database Management Software Official Website

See also: DB2, MySQL, Oracle, PostgreSQL, SQL, SQL Server, SQLite, Sybase

Symfony W ^

Admin Generator cheat sheet [pdf] (symfony-project.com)
symfony cheat-sheet: Criteria/Criterion/RS by Andréia Bohner [pdf] (andreiabohner.wordpress.com)
Symfony Cheat-Sheet - Database Schema by Andréia Bohner [pdf] (andreiabohner.wordpress.com)
Symfony Cheat-Sheet - Model (Modelo) by Andréia Bohner [pdf] (andreiabohner.wordpress.com)
Symfony Cheat-Sheet - View: partials, components, slots and component slots (DRY - Partials, Components, Slots e Component Slots do symfony) by Andréia Bohner [pdf] (andreiabohner.wordpress.com)
Symfony Cheat-Sheet - View by Andréia Bohner [pdf] (andreiabohner.wordpress.com)
Symfony Cheat-Sheet - Server Validation (Validação no Servidor) by Andréia Bohner [pdf] (andreiabohner.wordpress.com)
Symfony Cheat-Sheet - Helpers Part 2 - FORMS (Form Helpers) by Andréia Bohner [pdf, jpg] (andreiabohner.wordpress.com)
Symfony Cheat-Sheet - Helpers Part 1 - JAVASCRIP (JS) and AJAX (remote calls) (Helpers Javascript e Ajax) by Andréia Bohner [pdf] (andreiabohner.wordpress.com)
Symfony Cheat Sheet - Directory Structure and CLI (Estrutura de diretório e CLI (linha de comando)) by Andréia Bohner [pdf, jpg] (andreiabohner.wordpress.com)
tldr *php* [html] (cheat-sheets.org)

Official website: http://www.symfony-project.org/

Tapestry W ^

Apache Tapestry 5.0 by Howard M. Lewis Ship [pdf] (dzone.com)

Official website: tapestry.apache.org

Tcl/Tk - Tool Command Language W ^

Tcl/Tk Sripting Language Quick Reference by Paul Raines [pdf] (refcards.com)

Official website: http://www.tcl.tk/

TCP - Transmission Control Protocol W ^

TCP Ports list [html] (refcards.com)

TeX W ^

(plain) TeX Reference Card by Joseph H. Silverman [pdf, dvi, TeX source] (math.brown.edu/~jhs/)
AMSTeX Reference Card by Joseph H. Silverman [pdf, dvi, TeX source] (math.brown.edu/~jhs/)
TeX Quick Reference Card by Joseph H. Silverman (refcards.com copy) [pdf] (refcards.com)
AMSTeX Reference Card 1.3 by Joseph H. Silverman (digilife.be copy) [pdf] (digilife.be)

Official website: http://www.tug.org/

TLDs - Top-level domains W ^

VisiBone Country Chart [poster 122cm×61cm or 86cm×43cm, jpg] (visibone.com)
Country Code Splist VisiBone's “split list” of Internet Country Codes [html] (visibone.com)

TLS - Transport Layer Security; SSL - Secure Sockets Layer W ^

SSL Handshake With Two Way Authentication with Certificates by Christian Friedrich [pdf]

Trigonometry, Trig W ^

Trig Cheat Sheet by Paul Dawkins [pdf, pdf reduced] (tutorial.math.lamar.edu)

See also: Math

TTCN-3 (Testing and Test Control Notation version 3) W ^

Cheat sheets: Quick Reference Card for TTCN-3 by Axel Rennoch, Claude Desroches, Theo Vassiliou and Ina Schieferdecker [pdf] (blukaktus.com)	Documentation, Books, Articles: TTCN-3 Standard Suite by ETSI [pdf] (ttcn-3.org)
Official website: ttcn-3.org

Twitter W ^

Twitter Cheat Sheet [pdf] (docstoc.com)

Official website: twitter.com

TypeScript W

Cheatsheet for TypeScript by Rico Sta. Cruz [html] (devhints.io)
TypeScript Control Flow Analysis [png, pdf] (typescriptlang.org)
TypeScript Classes [png, pdf] (typescriptlang.org)
TypeScript Interfaces [png, pdf] (typescriptlang.org)
TypeScript Types [png, pdf] (typescriptlang.org)

Official website: typescriptlang.org

Ubuntu W ^

TLDR Pages [html] (cheat-sheets.org)
Most used commands [html] (cheat-sheets.org)
Ubuntu Cheat Sheet by Jacob Peddicord [html] (fosswire.com)
Awesome Ubuntu Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: ubuntu.com

UML - Unified Modeling Language W ^

Allen Holub's UML Quick Reference [html] (holub.com)
UML Quick Reference Card by Laurent Grégoire [pdf] (tnerual.eriogerg.free.fr)
Getting Started with UML by James Sugrue [pdf zip] (dzone.com)

Unicode W ^

The Unicode Character Code Charts [html] (utf.ru)
Free Unicode Fonts [html] (font.su)
Die Unicode-Datenbank [html] (sql-und-xml.de)
HTML Characters, Numeric Codes, 0-65535 by Bob Stein, VisiBone [html] (visibone.com)

Official website: http://www.unicode.org/

Unix W ^

TLDR Pages [html] (cheat-sheets.org)
Most used commands [html] (cheat-sheets.org)
Commonly used UNIX commands by Indiana Univ [pdf] (tiger.la.asu.edu)
UNIX commands reference card by University Technology Information Services [pdf] (digilife.be)
Treebeard's Unix Cheat Sheet [html] by Marc Kummel (rain.org)
UNIX BASH shell Quick Reference by Arnold Robbins [pdf] (tiger.la.asu.edu)
Set Operations in the Unix Shell Simplified by Peteris Krumins [html, pdf, txt] (catonmat.net)
The Definitive Guide to Bash Command Line History by Peteris Krumins [html, pdf, tex, txt] (catonmat.net)
Unix Systems Programming Cheat Sheet by Jacob Strieb [github pdf] (github.com)

See also: chmod, Debian, Linux, Solaris, Ubuntu, Vi, Vim, TLDR Pages.

Unreal Engine W ^

UnrealScript (UScript) Cheat Sheet [png] (udn.epicgames.com)

Official website: unrealengine.com

Vaadin W ^

Cheat sheets: Vaadin: A Familiar Way to Build Web Apps with Java by Marko Grönroos [pdf zip] (dzone.com) Getting Started with Vaadin by Marko Grönroos [pdf zip] (dzone.com) Mastering Portal UI Development With Vaadin and Liferay by Sami Ekblad, James Falkner [pdf] (dzone.com)	Documentation, Books, Articles, Video: Book of Vaadin: Vaadin 6.4 by Marko Grönroos [pdf] (vaadin.com) Official step by step video tutorial (youtube.com)
Official website: vaadin.com

VBScript - Visual Basic Scripting Edition W ^

ASP / VBScript Cheat Sheet Cheat Sheet by Dave Child [png, pdf] (addedbytes.com)

Verilog W, SystemVerilog W

Verilog Cheat Sheet by S Winberg and J Taylor [pdf] (marceluda.github.io)
Verilog Cheat Sheet (version 0.8) for CS552 - Spring 2013 by Vinay Gangadhar, Cherin Joseph & Prof. Karthikeyan Sankaralingam [pdf] (pages.cs.wisc.edu)
Summary of Synthesisable Verilog 2001 by Simon Moore [pdf] (cl.cam.ac.uk/)
Verilog HDL QUICK REFERENCE CARD by Qualis Design Corporation [pdf] (cseweb.ucsd.edu)
Quick Reference for Verilog® HDL by Rajeev Madhavan AMBIT Design Systems, Inc [pdf] (stanford.edu)
Verilog® Quick Reference Card by The College of New Jersey (TCNJ) [pdf] (tcnj.edu)
ECE 4750 Linux, Git, PyMTL, Verilog Cheat Sheet by Computer Systems Laboratory Cornell University [pdf] (csl.cornell.edu)
Verilog® Quick Reference Card [pdf] (ee.ic.ac.uk)
SystemVerilog (SV) Cheatsheet by Sergiu Duda and Marius Gîbu [html] ()
SystemVerilog Assertions (SVA) Cheatsheet by Sergiu Duda and Marius Gîbu [html] ()
Programmable Logic/Verilog [html] (en.wikibooks.org)

Official website: 1364-2005 - IEEE Standard for Verilog Hardware Description Language

VxCFS, VCS - Veritas Cluster File System W ^

Veritas Cluster Cheat sheet [pdf] (scribd.com)

VHDL W

VHDL Quick Reference Card [pdf] (owd.tcnj.edu)
ES 4 VHDL reference sheet [pdf] (vhdlweb.com)
VHDL Cheat Sheet by Ismail El Badawy [html] (github.com/ismailelbadawy/)
VHDL Cheat-Sheet by Bryan J. Mealy [pdf] (ee.hacettepe.edu.tr)
VHDL Quick Reference by SynthWorks Design Inc. [pdf] (synthworks.com)
VHDL cheat sheet [html] (viesurip.fr)
VHDL QUICK REFERENCE CARD by Qualis Design Corporation [pdf] (isy.liu.se)
VHDL Syntax Reference by Prof. Taek M. Kwon EE Dept, University of Minnesota Duluth [pdf] (atlas.physics.arizona.edu)

Official website: opensource.ieee.org/vasg

Vim - Vi IMproved W ^, Vi W ^

The Beginner's Vim Cheat Sheet: Vim Cheat Sheet Infographic & Vim Commands Cheat Sheet, Copy-Pasteable by August R. Garcia [pdf] (256kilobytes.com)
Vim Commands Cheat Sheet [html] (bullium.com)
VIM Quick Reference Card by Laurent Grégoire [html, dvi, pdf, tex] (tnerual.eriogerg.free.fr)
Graphical vi-vim Cheat Sheet and Tutorial [gif.zip, svg.zip] (viemu.com)
Vim Cheatsheet by Andrea Benazzo [png] (qitty.net)
Vim Reference Card by Michael Goerz [pdf, TeX] (users.physik.fu-berlin.de/~goerz/)
Graphical vi-vim Cheat Sheet and Tutorial [gif] (viemu.com)
The Vi Editor by Cardiff School of Computer Science & Informatics [html] (docs.cs.cf.ac.uk)
Basic VI Cheatsheet [html] (lagmonster.org)
Advanced VI Cheatsheet [html] (lagmonster.org)
Don's other stuff by Donald J. Bindner [pdf]
UNIX Vi Editor Quick Reference by Ying Zhang [pdf] (tiger.la.asu.edu)
vi Reference Card by HP [pdf] (digilife.be)
vi Quick Reference [pdf] (digilife.be)
Working Productively in Bash’s Vi Command Line Editing Mode (with Cheat Sheet) by Peteris Krumins [html, pdf, tex, txt] (catonmat.net)
Graphical vi-vim Cheat Sheet and Tutorial [gif] (viemu.com)
Graphical vi-vim Cheat Sheet and Tutorial [gif.zip, svg.zip] (viemu.com)
Vi/Ex Quick Reference by Cardiff School of Computer Science & Informatics [html] (docs.cs.cf.ac.uk)
vim TLDR page [html] (cheat-sheets.org)
Awesome VIM Cheatsheet by Julien Le Coupanec @LeCoupa [html] (github.com/LeCoupa)

Official website: http://www.vim.org/

Virtualization W ^

Getting Started with Virtualization by Edward L. Haletky [pdf] (dzone.com)

Visual Basic W ^ W ^

Microsoft Visual Basic Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)
VB.NET Quick Reference by Kellerman Software [pdf] (digilife.be)
C# and VB.NET Comparison Cheat Sheet by Steven Swafford [html, pdf, doc] (aspalliance.com)

VMware (VI) W ^

VI3 card - VMware's Virtual Infrastructure 3 (VI3) ESX environments by Forbes [pdf] (vmreference.com)

Official website: vmware.com

VoiceXML - Voice Markup Language W ^

Cheat sheet:

VoiceXML: elements - attributes [pdf] (zvon.org)

Official website: http://www.w3.org/Voice/

See also: XHTML, XML, XML Schema, XPath XSL, XSLT

vvvv W ^

Cheat sheets: don't panic - the nodes guide to vvvv [pdf] (vvvv.org)	Documentation, Books, Articles: Documentation [html] (vvvv.org) Linear Spread: illustrated guide to vvvv for newbies in computer arts [pdf eng] (vvvv.org) Linear Spread: иллюстрированное руководство по vvvv для новичков в интерактивных искусствах [pdf rus] (vvvv.org)
Official website: http://vvvv.org/

WebGL (Web-based Graphics Library) W ^

Cheat sheets: Official WebGL 1.0 API Quick Reference Card by Khronos Group & Miller & Mattson [pdf] (khronos.org/webgl/ & millermattson.com) WebGL Cheat Sheet v0.2 by Jacob Seidelin [htm, pdf] (nihilogic.dk)	Documentation, Books, Articles: WebGL Specification Version 1.0 by Khronos Group [html] (khronos.org) WebGL Public Wiki by Khronos Group [html] (khronos.org) WebGL articles by Mozilla [html] (mozilla.org) The series of lessons as a way of teaching myself WebGL by Giles [html] (learningwebgl.com)
Official website: http://www.khronos.org/webgl/

WebMatrix W ^

Cheat sheet: WebMatrix: Advanced Web Development Made Simple by James Sugrue [pdf] (dzone.com)	Documentation, Books, Articles: Learn WebMatrix [html] (microsoft.com)
Official website: www.microsoft.com/web/webmatrix/ See also: ASP

Wicket (Apache Wicket) W ^

Getting Started with Apache Wicket by Andrew Lombardi [pdf] (dzone.com)

Official website: wicket.apache.org

See also: Apache

Wikipedia W ^

Wikipedia Cheatsheet [html] (wikipedia.org)
Wiki-refcard [png] (wikimedia.org)
User contributions detail [png] (wikipedia.org)
Reference card of MediaWiki editing commands, by mjanich. [pdf] (wikipedia.org)
Reference card of MediaWiki editing commands, by mjanich. [PNG] (wikipedia.org)
MediaWiki Cheatsheet [pdf] (commons.wikimedia.org)

Official website: http://www.wikipedia.org/

Windows W ^

An A-Z Index of the Windows NT/XP command line [html] (ss64.com)
Windows Resources Kits Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)
Windows Important Directories and Files Quick Reference by Jialong He [pdf] (tiger.la.asu.edu)

Official website: http://www.microsoft.com/Windows/default.mspx

Windows Communication Foundation (WCF) W ^

Cheat sheet:

Getting Started with Windows Communication Foundation 4.0 by Scott Seely [pdf] (dzone.com)

Official website: Windows Communication Foundation

Windows Presentation Foundation (WPF) W ^

WPF Binding CheatSheet version 1.1 by NBD Tech [pdf] (nbdtech.com)
XAML for WPF Cheat Sheet by Blueboxes.co.uk [pdf] (blueboxes.co.uk)
Getting Started with Windows Presentation Foundation by Christopher Bennage and Rob Eisenberg [pdf] (dzone.com)
WPF Controls - A Visual Quick Start by Josh Fischer [html] (codeproject.com)
WPF Wonders: An Alphabetical Compendium of WPF Controls by Rod Stephens [html] (devx.com)

Official website: MSDN Windows Presentation Foundation SDK

Windows PowerShell W ^

Cheat sheet:

Windows PowerShell 2 | Cheat Sheet by Markus Widl [pdf] (de - galileocomputing.de)
WindowsPowerShell by Bruce Payette [pdf] (dzone.com)

Official website: microsoft.com/powershell

WordPress W ^

Official WordPress Theme Architecture Outline and Cheat Sheet [html] (wordpress.org)
WordPress Plugin API Cheat Sheet [png] (480x.com)
WordPress Theme Cheat Sheet [png] (480x.com)
WordPress Cheat Sheet by Andy Wibbels [pdf] (andywibbels.com)
HeadZoo WordPress Plugin API Cheatsheet [png] (headzoo.com)
Wordpress Helper Sheet [txt.zip, txt]

Official website: http://wordpress.org/

Xcode W ^

Xcode Cheat Sheet by Tobias Günther [pdf] (git-tower.com)

Official website: developer.apple.com/xcode/

XHTML - eXtensible HyperText Markup Language W ^

HTML/XHTML in one page by Alexander Krassotkin [html] (html.su)
XHTML Cheat Sheet [pdf] (cdburnerxp.se)
(X)HTML Elements and Attributes [html] (cookwood.com)
HTML & XHTML CheatSheet [html] (petefreitag.com)
HTML & XHTML Tag Quick Reference [pdf] (albany.edu)
fcXHTML Reference [html.zip] (apple.com)

Official website: http://www.w3.org/MarkUp/

See also: CSS, DOM, HTML, JavaScript, MathML, VoiceXML, XML, XML Schema, XPath, XSL, XSLT

XML - eXtensible Markup Language W ^

XML in one page [html] (xml.su)
XML 1.0 Syntax Quick Reference by Mulberry Technologies, Inc. [pdf] (mulberrytech.com)
Using XML in Java by Masoud Kalali [pdf] (dzone.com)

Official website: http://www.w3.org/XML/

See also: Feed, MathML, VoiceXML, XHTML, XML Schema, XPath, XSL, XSLT

XML Schema W ^

XML Schema - Structures Quick Reference Card by Dan Vint [pdf] (dvint.com)
XML Schema - Data Types Quick Reference Card by Dan Vint [pdf] (dvint.com)

Official website: http://www.w3.org/XML/Schema

See also: MathML, XHTML, XML, XPath, XSL, XSLT

XPath W ^

XSLT 1.0 and XPath 1.0 Quick Reference [pdf] (mulberrytech.com)
XPath by DeepX Ltd [pdf] (refcards.com)
XPath, CSS, DOM and Selenium: The Rosetta Stone by Michael Sorens [pdf: Locators table, Locators groups] (simple-talk.com)

Official website: http://www.w3.org/Style/XSL/

See also: CSS, DOM, MathML, Selenium, XHTML, XML, XML Schema, XSL, XSLT

XSL - Extensible Stylesheet Language W ^

Extensible Stylesheet Language (XSL) 1.0 by deepx [pdf] (mulberrytech.com)

See also: MathML, XHTML, XML, XML Schema, XPath, XSLT

Official website: http://www.w3.org/Style/XSL/

XSLT - Extensible Stylesheet Language Transformations W ^

XSLT 1.0 and XPath 1.0 Quick Reference [pdf] (mulberrytech.com)
XSLT 1.0 Quick Reference by DeepX Ltd [pdf] (refcards.com)
XSLT Referencee [html] (topxml.com)

Official website: http://www.w3.org/Style/XSL/

See also: MathML, XHTML, XML, XML Schema, XPath, XSL

XSS - Cross Site Scripting W ^

XSS Filter Evasion Cheat Sheet [html] (owasp.org)
XSS (Cross Site Scripting) Cheat Sheet [html] (ha.ckers.org)

Zen Coding W ^

Zen HTML Elements (Based on HTML 5 specification draft) [pdf] (code.google.com/p/zen-coding/)

Official website: code.google.com/p/zen-coding/

Donate

.NET W^

Ada W^

ADO.NET W^

Adobe Systems W^

Adobe Acrobat W^

AJAX - Asynchronous JavaScript And XML W^

Algebra W^

Amazon Web Services (AWS) W^

Android W^

Apache W^

Apache Ant W^

Apache Camel W^

Apache Cassandra W^

Apache Solr W^

APT - Advanced Packaging Tool W^

Arduino W^

ASCII - American Standard Code for Information Interchange W^

ASP - Active Server Pages W^

Assembly Language W^

Astronomy W^

AWK - Aho, Weinberger and Kernighan programming language W^

Azure (Azure Services Platform, Windows Azure Platform) W^

Bazaar (formerly Bazaar-NG, commandline tool bzr) - distributed revision control system W^

Berkeley DB (BDB, Oracle Berkeley DB) W^

Big OW^

BIRT - Business Intelligence and Reporting Tools Project (BIRT Project) W^

Blogger W^

Blueprint - CSS framework W^

BPEL - Web Services Business Process Execution Language (WS-BPEL) W^

Business Process Modeling (BPM) W^ and Business Process Modelling Notation (BPMN) W^

C W^

C# W^

C++ W^

Calculus and Analysis W^

Camera W^

Catalyst W^

Characters W^

Chef W^

Chemistry W^

chmod W^

Clojure W^

Cloud Computing W^

Cocoa W^

ColdFusion W^

Colour W^

Computer Science W^

Continuous Integration (CI) W^

Countries W^

Cron W^

CSS - Cascading Style Sheets W^

curl (cURL, Curl) W

CVS - Concurrent Versions System W^

Dart W

Datalog W

DB2 (IBM DB2) W^

db4o W^

Debian W^

Delphi W^

Design Pattern W^

Django W^

Docker W

Doctrine W^

Doctypes W^

DOM - Document Object Model W^

Domain-driven design (DDD) W^

DOT language W^

Drupal W^

DTD - Document Type Declaration W^

Eclipse W^

Ed - UNIX Text Editor W^

EJB - Enterprise JavaBean W^

Emacs W^

Erlang W^

F# W^

Fedora W^

Feed (Web Feed) W^: AtomW^, RSS W^

File W^

Firefox W^

FitNesse W^

.NET W ^

Ada W ^

ADO.NET W ^

Adobe Systems W ^

Adobe Acrobat W ^

AJAX - Asynchronous JavaScript And XML W ^

Algebra W ^

Amazon Web Services (AWS) W ^

Android W ^

Apache W ^

Apache Ant W ^

Apache Camel W ^

Apache Cassandra W ^

Apache Solr W ^

APT - Advanced Packaging Tool W ^

Arduino W ^

ASCII - American Standard Code for Information Interchange W ^

ASP - Active Server Pages W ^

Assembly Language W ^

Astronomy W ^

AWK - Aho, Weinberger and Kernighan programming language W ^

Azure (Azure Services Platform, Windows Azure Platform) W ^

Bazaar (formerly Bazaar-NG, commandline tool bzr) - distributed revision control system W ^

Berkeley DB (BDB, Oracle Berkeley DB) W ^

Big OW ^

BIRT - Business Intelligence and Reporting Tools Project (BIRT Project) W ^

Blogger W ^

Blueprint - CSS framework W ^

BPEL - Web Services Business Process Execution Language (WS-BPEL) W ^

Business Process Modeling (BPM) W ^ and Business Process Modelling Notation (BPMN) W ^

C W ^

C# W ^

C++ W ^

Calculus and Analysis W ^

Camera W ^

Catalyst W ^

Characters W ^

Chef W ^

Chemistry W ^

chmod W ^

Clojure W ^

Cloud Computing W ^

Cocoa W ^

ColdFusion W ^

Colour W ^

Computer Science W ^

Continuous Integration (CI) W ^

Countries W ^

Cron W ^

CSS - Cascading Style Sheets W ^

CVS - Concurrent Versions System W ^

DB2 (IBM DB2) W ^

db4o W ^

Debian W ^

Delphi W ^

Design Pattern W ^

Django W ^

Doctrine W ^

Doctypes W ^

DOM - Document Object Model W ^

Domain-driven design (DDD) W ^

DOT language W ^

Drupal W ^

DTD - Document Type Declaration W ^

Eclipse W ^

Ed - UNIX Text Editor W ^

EJB - Enterprise JavaBean W ^

Emacs W ^

Erlang W ^

F# W ^

Fedora W ^

Feed (Web Feed) W ^: AtomW ^, RSS W ^

File W ^

Firefox W ^

FitNesse W ^

Firefox Add-ons W ^

Fonts W ^

Fortran W ^

Freeware W ^

FTP - File Transfer Protocol W ^