Hyper - Extensible, cross-platform terminal built on open web standards.
Flowkey - The easiest way to learn piano with your iPhone or iPad
iTerm2 - A terminal emulator for macOS that does amazing things.
Yousician - Learn to play music at home, at your own pace
GEEKtyper - Code like in the movies
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.