Twitch Creative - Watch artists create. Twitch expands into the arts.
AMPLI.FI - Live online music community. Twitch for tunes.
Artstel - Find and connect with the top creative talent worldwide
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Daisie - A new platform for creative collaboration
Blattarco - Creative self-developement for musicians of all level.