69 and still counting fabulous free cheat sheets for almost any coding and programming language! Some of them are: PHP, CSS, MySQL, Apache, Ruby, Perl, Python, mod_rewrite, XHTML, Linux, jQuery, C++, Java, ColdFusion, WordPress, Visual Basic, XML, Ruby on Rails, and more! Grab your free cheat sheets coming in PDF, PNG, or HTML!

ActionScript

• Flash ActionScript Quick Reference - Jialong He

Apache

• Apache Cheat Sheet - petefreitag.com
• Apache 1.3 Quick Reference Card - Andrew Ford

ASP

• ASP / VBScript Cheat Sheet – Added Bytes

C#

• C Sharp Cheat Sheet - Cembo Obmec
• C# and VB.NET Comparison Cheat Sheet - Steven Swafford
• Core CSharp and .NET Quick Reference – Stephen C. Perry

C++

• C++ Quick Reference Sheet - dreamincode.net
• STL Quick Reference 1.29 - Yotam Medini

ColdFusion

• CFSCRIPT ColdFusion Cheat Sheet - petefreitag.com

CSS

• CSS Cheat Sheet (V2) – Added Bytes
• RGB Hex Colour Chart – Added Bytes
• CSS (Cascading Style Sheets) in one page - css.su

Flex

• Adobe flex 3 cheat sheet - depanca@gmail.com

htaccess

• htaccess Cheatsheet - thejackol.com

(X)HTML

• HTML Cheat Sheet – Added Bytes
• HTML Character Entities Cheat Sheet – Added Bytes
• RGB Hex Colour Chart – Added Bytes
• HTML/XHTML in one page – html.su
• XHTML Cheat Sheet - cdburnerxp.se
• HTML & XHTML Tag Quick Reference – albany.edu

Java

• JAVA Quick Reference - Jialong He
• JAVA Programming Guide -  digilife.be
• SAX 2.0 for Java (Extensions and Helpers) - DeepX
  
• Java Quick Reference - digilife.be

JavaScript

• JavaScript Cheat Sheet – Added Bytes
• JavaScript in one page – javascript.su
• JavaScript Cheat Sheet - Cembo Ombec

jQuery

• jQuery 1.2 Cheat Sheet - labs.colorcharge.com
• jQuery 1.2 - Adrien Gibrat

Linux

• The one page Linux Manual - Squadron
• Linux System Calls Quick Reference - Jialong He
• Linux Security Quick Reference Guide - Dave Wreski & Benjamin Thomas

mod_

• Mod_perl Quick Reference Card - Andrew Ford
• mod_rewrite Cheat Sheet (V2) – Added Bytes

MySQL

• MySQL Cheat Sheet – Added Bytes
• MySQL Database Quick Reference - DeepX
• MySQL Cheat Sheet - nparikh.org

Oracle

• Oracle PL/SQL Cheatsheet - yagc.ndo.co.uk
• Oracle Server Architecture - Dr. Lars Ditzel

Perl

• Perl 5 Cheat Sheet - Juerd Waalboe
• Perl Quick Reference Card – johnbokma.com
• Perl Regular Expression – Quick Reference 1.04 - mnlab.cs.depaul.edu/~ehab/
• Perl Win32 Quick Reference – Jialong He
• Perl Reference Card - Micheal Goerz

PHP

• PHP Cheat Sheet (V2) – Added Bytes
• PHP 4 Quick Reference Card – Steven R. Gould
• PHP Cheat Sheet with special PHP syntax – blueshoes.org
• Apple’s PHP Cheat Sheet - apple.com

Python

• Python Cheat Sheet – Added Bytes
• Python 101 Cheat Sheet - ibm.com
• Python Quick Reference Card – Laurent Pointal
• Python 2.4 Quick Reference – rguet.free.fr

Regular Expressions

• Regular Expressions Cheat Sheet (V2) – Added Bytes

Ruby

• Ruby QuickRef - zenspider.com
• Ruby Cheatsheet - cenophobia.com
• Ruby Language QuickRef - Ryan Davis & Austin Ziegler

Ruby on Rails

• Ruby on Rails Cheat Sheet – Added Bytes
• RubyOnRails-Cheatsheet - Blaine Kendall

SQL Server

• SQL Server Cheat Sheet – Added Bytes

VBScript

• ASP / VBScript Cheat Sheet – Added Bytes
• VBScript Cheat Sheet - Cembo Obmec

Visual Basic

• Microsoft Visual Basic Quick Reference - Jialong He
• VB.NET Quick Reference – Kellerman Software
• Visual Basic Cheat Sheet – Cembo Obmec

WordPress

• Official WordPress Theme Architecture Outline and Cheat Sheet – wordpress.org
• Wordpress Theme Cheat Sheet - headzoo.com
• Wordpress Helper Sheet - headzoo.com

XML

• XML Schema Quick Reference – Dan Vint