Simply Piano - Fast and fun way to learn piano
productboard - Beautiful and powerful product management.
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.
Yousician - Learn to play music at home, at your own pace
ProductPlan - Cloud-based product roadmap software solution