SoundManager 2 : Using HTML5 and Flash, SoundManager 2 provides reliable cross-platform audio under a single JavaScript API.
meSing.js : meSing.js is a JavaScript singing synthesis library that uses the Web Audio API's DSP capabilities in conjunction with the meSpeak.js speech synthesis...
Web Forms : Web Forms 2.0 Cross-Browser Implementation
Tone.js : Tone.js is a Web Audio framework for creating interactive music in the browser. The architecture of Tone.js aims to be familiar to both musicians and ...
Essentia : Open-source library and tools for audio and music analysis, description and synthesis
An interface for the Web Audio API that supports rhythms, multiple instruments, repeating sections, and complex time signatures.