Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
CodePen - A front end web development playground.
Double Commander - Double Commander is a cross-platform open source file manager with two panels side by side.
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
XYplorer - File Manager for Windows
JS Bin - Sample of the bin: