SoundClick - SoundClick is a music-based social community.
AMPLI.FI - Live online music community. Twitch for tunes.
Openwhyd - Collect and Share the tracks you love.
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
FoxTube - Play YouTube video continuously with playlists. FoxTube features:
Soundstripe for Twitch - Free music for Twitch streamers