SongMine - Songmine is a free online tool for discovering and recording chord progressions with your favorite DAW.
Touch Pianist - Play piano like a pro without playing piano.
lightnote - An interactive site to learn the basics of music theory 🎶
EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
FL Studio Mobile - Create & save multi-track music projects on a smartphone
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.