tonestro - Practice & improve on your wind instrument while having fun
DistroKid - Unlimited uploads to iTunes and more. Keep 80-100% of your royalties.
Violin by Trala - Violin by Trala is a music learning app that is designed specifically for Violin users.
TuneCore - Music distribution platform for artists to sell their content worldwide
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
LANDR - LANDR is online music software for creators: music mastering, digital music distribution, free sample packs, collaboration tools, music promotion, and more. Try it free.