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.
Guitar Pro 7 - Create, play and share your tabs
music21 - Music21 is a Python-based toolkit for computer-aided musicology.
JJazzLab - Fed up with boring backing tracks ? Try JJazzLab!
Band-in-a-Box - Band-in-a-Box is so easy to use!