AIVA - The AI composing emotional soundtrack music
RapidComposer - MusicDevelopments RapidComposer: Music Prototyping and Automated Composition Software
WolframTones - Listen to what I just found in the WolframTones music universe
Captain Chords - Write chord progressions in your favorite DAW
WaveBots Editor - Procedural music and sound maker that exports to Wav, MIDI, GoatTracker and much more.
Odesi - ODESI is a music sketchpad that exports your projects to Audio and MIDI.