voxel.css : The goal of this project is to provide a lightweight 3D CSS library with very simple implementation.
Autotrack : Automatic and enhanced Google Analytics tracking for common user interactions on the web.
Sammy.js : Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.
Vex : Vex is a modern dialog library which is highly configurable, easily stylable, and gets out of the way. You'll love vex because it's tiny (6kb minified...
Crafty : JavaScript Game Engine, HTML5 Game Engine
Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects.