Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Helio Workstation - Cross-platform lightweight speed-painting tool for creating music.
MMA - “MMA—Musical MIDI Accompaniment” is an accompaniment generator.
ChordPulse - ChordPulse is interactive software that’s designed to help you learn music on your instrument.
Guitar Pro 7 - Create, play and share your tabs
NtEd - Music Score Notation editor.