CodeShare.io - Realtime code sharing for developers
myCompiler - Run your favourite programming languages online
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
Browxy - Browxy is a web application that serves as an integrated development environment where you can write in coding languages, compile them or edit them.