Simply Piano - Fast and fun way to learn piano
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.
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Yousician - Learn to play music at home, at your own pace
Slack - A messaging app for teams who see through the Earth!