Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
NtEd - Music Score Notation editor.
MMA - “MMA—Musical MIDI Accompaniment” is an accompaniment generator.
Guitar Pro 7 - Create, play and share your tabs
JJazzLab - Fed up with boring backing tracks ? Try JJazzLab!
Synfire - The comprehensive Music Prototyping Studio for professionals and enthusiasts.