The Web Audio API, developed by the W3C Audio WG
Navigable waveform built on Web Audio and Canvas
A Web Audio framework for making interactive music in the browser.
Media Tags Reader (ID3, MP4, FLAC)
Library to simplify the way you create and manipulate sounds with the Web Audio API.
Web Audio DAW. Use the HTML5 Web Audio API for dynamic sound synthesis. It's like jQuery for your ears.
The HTML5 Audio Compatibility Layer
alphaTab is a cross platform music notation and guitar tablature rendering library.
Web Audio Library
Flocking - Creative audio synthesis for the Web