Whether you’ve forgotten the name of a function or the property of a cascading style sheet – handy cheat sheets deliver the information you are looking for – immediately. Most cheat sheets are available as .pdf or .png-files, so you can print them and use them every day for whatever projects you’re currently working on. 

This is a collection of cheatsheets that can be freely found on the web.

Actionscript

Ajax

Apache

ASCII Character Codes

CSS

CVS

Firefox

Google

HTML/XHTML

Java

JavaScript

Misc

MySQL

Photoshop/Gimp

PHP

Unix/Linux

XML