MilkyTracker - MilkyTracker is an open source, multi-platform music application for creating .MOD and .
Musicope - The Piano Game. Contribute to oldrich-s/musicope development by creating an account on GitHub.
OpenMPT - OpenMPT is a popular tracker software for Windows.
Playground Sessions - Online piano learning game.
FamiStudio - FamiStudio is very simple music editor for the Nintendo Entertainment System or Famicom. It is designed to be easier to use than FamiTracker, but its feature set is also much more limited.
Synthesia - A fun way to learn how to play the piano.