TraceKit : Not all browsers support stack traces on error objects, but TraceKit squeezes out as much useful information as possible and normalizes it.
Wave.js : Audio visualizer library for javascript. Create dynamic animations that react to an audio file or audio stream.
InstantClick : InstantClick is a JavaScript library that dramatically speeds up your website, making navigation effectively instant in most cases.
RequireJS : RequireJS is a JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Rhino ...
jsfx : This is a javascript library (with frontend) for sound effect generation.
A Modern, Lightweight Open-Source JavaScript Library for Interactive Maps