Prezi - Welcome to Prezi, the presentation software that uses motion, zoom, and spatial relationships to bring your ideas to life and make you a great presenter.
CodePen - A front end web development playground.
Reveal.js - A framework for easily creating beautiful presentations using HTML
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
Sozi - Sozi
JS Bin - Sample of the bin: