Hum - Songwriting for iPhone
Roland 808303.studio - TR-808 drum machine and TB-303 bass synthesizer emulator
Songcraft.io - A platform for songwriters to write, organize & collaborate.
Sampulator - Make (and record) beats on your keyboard
Horucco - Horucco is an cloud based app for musicians, songwriters, producers of every skill levelExplore chords and discover related chords on the fly.
Magenta Studio - Make music & art using machine learning