Able Player : Able Player is a fully accessible cross-browser media player. It uses the HTML5 or element for browsers that support them, and (optionally) the JW P...
MediaElement.js : HTML5 and made easy.
One file. Any browser. Same UI.
flv.js : An HTML5 Flash Video (FLV) Player written in pure JavaScript without Flash. LONG LIVE FLV!
Band.js : An interface for the Web Audio API that supports rhythms, multiple instruments, repeating sections, and complex time signatures.
SoundManager 2 : Using HTML5 and Flash, SoundManager 2 provides reliable cross-platform audio under a single JavaScript API.