jquip : Smaller, Lighter, Faster, more modular jQuery - include only the parts you want! Don't use it, Don't include it.
Processing.js : Processing.js is the sister project of the popular Processing visual programming language, designed for the web. Processing.js makes your data visuali...
Crafty : JavaScript Game Engine, HTML5 Game Engine
rsvp.js : A lightweight library that provides tools for organizing asynchronous code
Autotrack : Automatic and enhanced Google Analytics tracking for common user interactions on the web.
Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.