jsmad : jsmad is a pure javascript MP3 decoder, based on libmad, with an ID3 decoder written from scratch.
Rickshaw : Rickshaw is a JavaScript toolkit for creating interactive time series graphs.
TodoMVC : A project which offers the same Todo application implemented using MV concepts in most of the popular JavaScript MV frameworks of today.
jsfx : This is a javascript library (with frontend) for sound effect generation.
stream.js : stream.js is a tiny stand-alone Javascript library that unlocks a new data structure for you: streams.
base2 is a lightweight library that irons out all the annoying differences in JavaScript implementations. It provides the additional functionality from JavaScript 1.6+ that only Mozilla browsers implement.