Snipper.ml - A simple snippet manager in the menubar
CodePen - A front end web development playground.
Codespace - A beautiful cross-platform code snippet manager
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
DhiWise - DhiWise is a ProCode platform that helps you build clean, scalable, and customizable native and cross-platform apps. Focus on what matters as a programmer and let DhiWise do the rest.
Liveweave - Liveweave is a HTML5, CSS3 & JavaScript playground for web designers and developers