Guitar Pro 7 - Create, play and share your tabs
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
music21 - Music21 is a Python-based toolkit for computer-aided musicology.
OpenMPT - OpenMPT is a popular tracker software for Windows.
Harmony Assistant - Harmony Assistant is an unbeatable software for computer-assisted music composition and editing.
Band-in-a-Box - Band-in-a-Box is so easy to use!