Autotrack : Automatic and enhanced Google Analytics tracking for common user interactions on the web.
Web Forms : Web Forms 2.0 Cross-Browser Implementation
ClippyJS : Add Clippy or his friends to any website for instant nostalgia.
TodoMVC : A project which offers the same Todo application implemented using MV concepts in most of the popular JavaScript MV frameworks of today.
Zepto.js : Zepto is a minimalist JavaScript library for modern browsers with a largely jQuery-compatible API. If you use jQuery, you already know how to use Zept...
stream.js is a tiny stand-alone Javascript library that unlocks a new data structure for you: streams.