jsmad : jsmad is a pure javascript MP3 decoder, based on libmad, with an ID3 decoder written from scratch.
JSDB.io : JSDB is a collection of the best javascript libraries
dancer.js : dancer.js is a high-level audio API, usable with both Mozilla's Audio Data API and Webkit's Web Audio API with flash fallback, designed to make sweet ...
ClippyJS : Add Clippy or his friends to any website for instant nostalgia.
TraceKit : Not all browsers support stack traces on error objects, but TraceKit squeezes out as much useful information as possible and normalizes it.
Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects.