Zencoder
Zencoder is the creator of an open-source HTML5 video player, Video.js, built with Javascript, HTML, and CSS. Video.js plays video via native playback in all HTML5 browsers and devices, or through Adobe Flash when HTML5 playback is not available.
Datacopia
Datacopia is built in HTML5 and runs on any platform with a browser that supports the Html5 canvas element. It makes use of D3.js and the NVD3 library to provide its interactive graphics. It uses the Heroku PaaS stack.