DistroKid - Unlimited uploads to iTunes and more. Keep 80-100% of your royalties.
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
TuneCore - Music distribution platform for artists to sell their content worldwide
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
Ditto Music - Release your music online, set up a record label and keep 100% of royalties
soundrop - Soundrop is an app that allows you to create your own personalized sound track to keep you focused or relax.