Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
JJazzLab - Fed up with boring backing tracks ? Try JJazzLab!
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Guitar Pro 7 - Create, play and share your tabs
Slack - A messaging app for teams who see through the Earth!