Sound Manager 2
A JavaScript Sound API supporting MP3, MPEG4 and HTML5 audio + (experimental) RTMP, providing reliable cross-browser/platform audio control in as little as 10 KB. BSD licensed.
Buzz
Buzz is a small but powerful Javascript library that allows you to easily take advantage of the new HTML5 audio element. It tries to degrade gracefully on non-modern browsers.
Flocking
Flocking - Creative audio synthesis for the Web
Audio.js
A cross-browser javascript wrapper for the html5 audio tag
Tuna
An audio effects library for Web Audio, made by www.dinahmoe.com
Webaudio.js
web audio library for games
Timbre.js
JavaScript library for objective sound programming
Amplitudejs
A Javascript library that allows you to control the design of your media controls in your webpage -- not the browser. No dependencies (jQuery not required)
Tone.js
A Web Audio framework for making interactive music in the browser.
Audio5js
The HTML5 Audio Compatibility Layer
Wavesurfer.js
Navigable waveform built on Web Audio and Canvas