Abundant Music - Generate royalty free music with a simple but very powerful procedural music creator
RapidComposer - MusicDevelopments RapidComposer: Music Prototyping and Automated Composition Software
AIVA - The AI composing emotional soundtrack music
Captain Chords - Write chord progressions in your favorite DAW
WolframTones - Listen to what I just found in the WolframTones music universe
Odesi - ODESI is a music sketchpad that exports your projects to Audio and MIDI.