This is my jam. : A place to put your favorite song of the moment & hear great music, handpicked every day by friends.
Freesound : Freesound is a collaborative database of Creative Commons Licensed sounds. Browse, download and share sounds.
Cecilia : Cecilia is an audio signal processing environment aimed at sound designers. Cecilia mangles sound in ways unheard of. Cecilia lets you create your own...
Band.js : An interface for the Web Audio API that supports rhythms, multiple instruments, repeating sections, and complex time signatures.
sfxr : A tool to quickly generate 8bit/16 bit-soud effects!