howler.js : howler.js is an audio library for the modern web. It defaults to Web Audio API and falls back to HTML5 Audio.
Audiotool : Audiotool is a powerful online music production studio right in your browser.
sonicsquirrel.net : sonicsquirrel.net is a platform dedicated to netlabels and netaudio.
All music you find here is released under open licenses (mainly Creative Commons)...
jsmad : jsmad is a pure javascript MP3 decoder, based on libmad, with an ID3 decoder written from scratch.
Fragment : Fragment is a collaborative cross-platform audiovisual live coding environment with pixels based real-time image-synth approach to sound synthesis, th...