Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
MMA - “MMA—Musical MIDI Accompaniment” is an accompaniment generator.
Sundog Scale Studio - The MIDI chords and melodies laboratory
JJazzLab - Fed up with boring backing tracks ? Try JJazzLab!
Guitar Pro 7 - Create, play and share your tabs
LilyPond - GNU LilyPond is a computer program for music engraving.