Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Synthesia - A fun way to learn how to play the piano.
MMA - “MMA—Musical MIDI Accompaniment” is an accompaniment generator.
Playground Sessions - Online piano learning game.
Guitar Pro 7 - Create, play and share your tabs
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.