script.aculo.us : script.aculo.us provides you with
easy-to-use, cross-browser user
interface JavaScript libraries to make
your web sites and web applications fly.
TodoMVC : A project which offers the same Todo application implemented using MV concepts in most of the popular JavaScript MV frameworks of today.
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
hunt : Library to detect when DOM elements become visible and disappear on scroll.
Autotrack : Automatic and enhanced Google Analytics tracking for common user interactions on the web.
Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects.