WaveBots Editor - Procedural music and sound maker that exports to Wav, MIDI, GoatTracker and much more.
Hum - Songwriting for iPhone
Abundant Music - Generate royalty free music with a simple but very powerful procedural music creator
Tape It - App for songwriting & audio recording.
Wotja - WOTJA generates live ambient, adaptive, reflective & generative music, MIDI, text to music melodies, creative writing 'cut-up' & more.
Songcraft.io - A platform for songwriters to write, organize & collaborate.