Band.js : An interface for the Web Audio API that supports rhythms, multiple instruments, repeating sections, and complex time signatures.
JavascriptOO : Every javascript project you should be looking into.
With examples, categories, install commands, CDN links, project and author stats, and more.
rsvp.js : A lightweight library that provides tools for organizing asynchronous code
Rickshaw : Rickshaw is a JavaScript toolkit for creating interactive time series graphs.
meSpeak.js : meSpeak.js (modulary enhanced speak.js) is a 100% client-side JavaScript text-to-speech library
A simple library for handling keyboard shortcuts in Javascript.