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.
BrowserQuest
"BrowserQuest" is written in HTML5 and WebSockets and is playable from modern web browsers. The client makes use of HTML5's canvas element to render the graphics, web workers to initialize the map without affecting the rest of the page, localStorage to save progress, media queries to dynamically resize the game to the device, and HTML5 Audio to render the sound. The server uses node.js communicating with the browser using WebSockets. "BrowserQuest" is a demonstration of the technology that it uses.