OverAPI.com is a great site which has almost all of the cheat sheets of programing languages, with its well-structured simplified layout you can easily find the cheat sheet of your language, and the cheat codes are colored to make it so simple and easy to understand. It is a great site for Novice and expert programmers to learn and utilize the programming codes.
The OverAPI.com also has a link to some great developer tools of various languages such as CSSMatic for CSS, JS Beautifier for JavaScrips and more. Also it has a Chrome Extension and Commenting area where you can discuss about the features of the site.
OverAPI.com is a great site you should visit often if you are an IT Geek.