Flowkey - The easiest way to learn piano with your iPhone or iPad
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Yousician - Learn to play music at home, at your own pace
Invision - Prototyping and collaboration for design teams
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Sketch - Professional digital design for Mac.