CodeShare.io - Realtime code sharing for developers
Pastebin.com - Pastebin.com is a website where you can store text for a certain period of time.
CodePen - A front end web development playground.
CodeChef IDE - CodeChef IDE is a free online tool for developers helping them in writing codes and programs.
Liveweave - Liveweave is a HTML5, CSS3 & JavaScript playground for web designers and developers
myCompiler - Run your favourite programming languages online