myCompiler - Run your favourite programming languages online
CodeShare.io - Realtime code sharing for developers
CodeChef IDE - CodeChef IDE is a free online tool for developers helping them in writing codes and programs.
CodePen - A front end web development playground.
Online Python - Online Python is a web application where you write codes in python language in the dedicated text space and the shell output is delivered to you in another text box on the right.
Liveweave - Liveweave is a HTML5, CSS3 & JavaScript playground for web designers and developers