100+个程序员开发必备参考手册（在线及下载）
即使经验丰富，天赋过人，也不得不承认，你并不能记得所有的东西，尤其是各种各样的语言的API，参考手册（Cheat Sheet）和Google肯定是必备，为了更方便的使用，也有很多有心的人收集整理了很多，比如下面这些。
不过，在这之前再推荐一个最近发现的插件，将这些一网打尽，很不错的体验：
All Cheat Sheets Chrome Extension
如果插件打不开，也可以直接打开网站 http://overapi.com
jQuery
JavaScript
- JavaScript Cheat Sheet
- JavaScript Cheat Sheet — PNG
- JavaScript Cheat Sheet — PDF
- JavaScript Reference
- JavaScript and Browser Objects Quick Reference
- Regular Expressions for JavaSript — free online quick reference
PHP
- PHP Cheat Sheet
- PHP Frameworks Cheat Sheet
- symfony PHP5 framework — Admin Generator cheat sheet — PDF
- PHP Cheat Sheet — PDF
- PHP Cheat Sheet — PNG
- PHP Cheat Sheet with special php syntax
- Regular Expressions Cheat Sheet — PNG
HTML/XHTML
- HTML Cheat Sheet
- XHTML Cheat Sheet
- A Simple Guide To HTML — Cheat Sheet
- HTML & XHTML Tag Quick Reference
- HTML Cheat Sheet
- HTML Entities
- HTML CODES CHEAT SHEET
- XHTML
- XHTML Cheat Sheet v. 1.03 — PDF
CSS
- CSS Cheat Sheet
- CSS 2 — Quick Reference Guide — PDF
- CSS Cheat Sheet — PDF
- CSS Cheat Sheet — PNG
- CSS Property Index
- Cascading Style Cheatsheet
- CSS Shorthand Guide
MySQL
Python
- Python Cheat Sheet
- Python 101 cheat sheet
- Python Cheat Sheet
- Python Cheat Sheet — PDF
- Python Quick Reference
- Python 2.4 Quick Reference
Ruby
- Ruby Cheat Sheet
- Ruby on Rails Cheat Sheet
- ActiveRecord Relationships — Ruby on Rails cheat sheet guide — PDF
- RubyOnRails-Cheatsheet — PDF
- Ruby on Rails Cheat Sheet — PNG
- Ruby on Rails cheat sheet guide — PDF
- Ruby quick reference
- Threadeds Ruby Cheat Sheet
- What Goes Where? — Ruby on Rails cheat sheet — PDF
Actionscript
ASP
Flash
ASCII Character Codes
- ASCII Cheat Sheet
- Character Entity References in HTML 4 and XHTML 1.0
- HTML Character Entities Cheat Sheet — PNG
- HTML Character Entities Cheat Sheet — PDF
- HTML special character reference
- HTML — Special Entity Codes
- Special ASCII HTML Character Codes
- XHTML Character Entity Reference
XML
- XML Cheat Sheet
- XML Schema Cheat Sheet
- Fusebox 4.1 XML Cheat Sheet
- MathML Reference — PDF
- VoiceXML Reference — PDF
- XML TopicMaps 1.0 — Quick Reference Card — PDF
- XML Quick References — PDF
- XML Schema 2001: children — parents — PDF
- XML Schema 2001: elements — attributes — PDF
- XML Schema 2000/10 — PDF
- XML Schema — Structures Quick Reference — PDF
- XML Schema — Data Types Quick Reference — PDF
- XSL FO Reference — PDF
- XSLT Quick References — PDF
- XSLT Quick Reference Card — PDF
- XSLT Reference
Apache
Ajax
- AJAX Cheat Sheet
- What’s Ajax? — PDF
- Prototype Dissected — Cheat Sheet PNG
- scriptaculous Combination Effects — Cheat Sheet — PDF
C# and VB.NET
CVS
C++
- C++ Cheat Sheet
- C++ Containers Cheat Sheet
- C++ Quick Reference Sheet (Cheat Sheet) — PDF
- How to Program in C++ — Language Summary
Django
Firefox
- Firefox Cheat Sheet
- Firefox Add-ons Cheat Sheet
- Firefox Keyboard Shortcuts — PDF
- Firefox Shortcuts Sheet
- Mozilla Firefox Cheat Sheet
- Mozilla Thunderbird Cheat Sheet
- Keyboard Shortcuts
- Google Cheat Sheet
- Google Chrome Cheat Sheet
- Google Maps Cheat Sheet
- Google App Engine Cheat Sheet
- Gmail Shortcuts (printable cheatsheet)
- Google Advanced Operators (Cheat Sheet)
- Google Cheat Sheet (Version 1.06) — PDF
- Google Cheat Sheet — auch als PDF
- Google Cheat Sheets — auch als PDF
- Google Help : Cheat Sheet
Java
Microformats
Misc
- CHMOD Chart
- Complete listing of common camera symbols.
- The Unicode-Database
- RGB Hex Colour Chart — PNG
- Pretty Good PGP Reference Card
- Search Engine Cheat Sheet
- Quick Reference Cards
Oracle
Perl
- Perl Cheat Sheet
- Perl Regular Expression -Quick Reference — PDF
- Perl Cheat Sheet
- Perl Cheat Sheet
- Perl 5 Cheat Sheet
- Perl Quick Reference Card — PDF
- Perl Regexp Quick Reference Card — PDF
Photoshop/Gimp
- Photoshop Cheat Sheet
- Gimp Cheat Sheet
- Gimp Quick Reference Card v.1.0
- Photoshop 7.0 Quick Reference Card for Windows — PDF
- Photoshop CS2 Keyboard Shortcuts (Windows) — PDF
- Photoshop CS2 Keyboard Shortcuts (Macintosh) — PDF
Regular Expressions
- Regular Expressions Cheat Sheet
- Regular Expressions Cheat Sheet
- Regular Expression Cheat Sheet (.NET)
Unix/Linux
- Linux Cheat Sheet
- Unix Cheat Sheet
- Linux Shortcuts and Commands
- quick_reference [GNU screen]
- Unix Cheat Sheet
- The One Page Linux Manual — Version 3 — PDF
- TCP Ports list (3498 ports in list)
- Treebeard’s Unix Cheat Sheet
- Essential Vim keyboard shortcuts Cheat Sheet
- VIM Quick Reference Card
- Vim Commands Cheat Sheet
Weblog
- Blogger Cheatsheet — PDF
- TypePad Cheatsheet — PDF
- Movable Type Cheatsheet — PDF
- MovableType
- WordPress Cheatsheet — PDF
- WP — WordPress Cheat Sheet Theme Tags und Plugin-API — PDF
Windows
- Windows Cheat Sheet
- An A-Z Index of the Windows NT/XP command line
- Graphical vi-vim Cheat Sheet and Tutorial
- Power Point 2000 — Keyboard Shortcuts
- POWERPOINT 2003 — Quick Reference Card
- TCP Ports list (3498 ports in list)
- Windows — Alt Key Numeric Codes
更多可以查看这里： http://overapi.com