CodePen - A front end web development playground.
Wren - Offset your carbon footprint by saving rainforests
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
Klima - Go carbon neutral
JS Bin - Sample of the bin:
Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.