TogetherJS : TogetherJS is a free, open source JavaScript library by Mozilla that adds collaboration features and tools to your website. By adding TogetherJS to yo...
Crafty : JavaScript Game Engine, HTML5 Game Engine
SPF : A lightweight JS framework for fast navigation and page updates from YouTube
Headroom.js : Headroom.js is a lightweight, high-performance JS widget (with no dependencies!) that allows you to react to the user's scroll.
css3-mediaqueries-js : make CSS3 Media Queries work in all browsers (JavaScript library)
A simple library for handling keyboard shortcuts in Javascript.