Odesi - ODESI is a music sketchpad that exports your projects to Audio and MIDI.
Captain Chords - Write chord progressions in your favorite DAW
RapidComposer - MusicDevelopments RapidComposer: Music Prototyping and Automated Composition Software
Orb Composer S - Orb is a music composition Artificial Intelligence.
Band-in-a-Box - Band-in-a-Box is so easy to use!
Helio Workstation - Cross-platform lightweight speed-painting tool for creating music.