SongMine - Songmine is a free online tool for discovering and recording chord progressions with your favorite DAW.
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
lightnote - An interactive site to learn the basics of music theory 🎶
keezy - A colorful soundboard. Play with music.
FL Studio Mobile - Create & save multi-track music projects on a smartphone
Splice - Music creation, collaboration, and sharing made simple.