jquip : Smaller, Lighter, Faster, more modular jQuery - include only the parts you want! Don't use it, Don't include it.
rsvp.js : A lightweight library that provides tools for organizing asynchronous code
Prototype : Easy Ajax and DOM manipulation for dynamic web applications
Crafty : JavaScript Game Engine, HTML5 Game Engine
Namespace.js : Namespace.js is a small javascript script which provide namespacing utilities. It is framework independent. It also allows you to remotely include fil...
Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.