Stave'n'Tabs - iOS and macOS notation and tablature editor with MIDI and MusicXML files support and chromatic...
Synthesia - A fun way to learn how to play the piano.
Chordsheet Maker - Create chord sheets or lead sheets quick and easily from your iPad. Add rhythms, endings, segno, codas and all what's necessary for your musicians to know what's your music about. Transcription made easy!
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.
Tonelib JAM - Create, edit, print and listen to tablature and guitar sheet music
Playground Sessions - Online piano learning game.