Timeline : Beautifully crafted timelines that are easy, and intuitive to use.
PeerJS : Peer-to-peer data in the web browser.
PeerJS completes WebRTC as an API abstraction, connection broker, and binary serialization format
The HTML5 Shiv : The HTML5 Shiv enables use of HTML5 sectioning elements in legacy Internet Explorer and provides basic HTML5 styling for Internet Explorer 6-9, Safari...
SoundManager 2 : Using HTML5 and Flash, SoundManager 2 provides reliable cross-platform audio under a single JavaScript API.
yepnope.js : A Conditional Loader For Your Polyfills!
The Closure Compiler, Library, Templates, and Stylesheets help developers create powerful and efficient JavaScript.