Amper Music - Artificial intelligence music composer
klaep - music collaboration - klaep is a social music collaboration network for musicians
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Madsounds - It’s like Discover Weekly, but daily.
WaveBots Editor - Procedural music and sound maker that exports to Wav, MIDI, GoatTracker and much more.
MisterJack - Make and share playlists