tonestro - Practice & improve on your wind instrument while having fun
Violin by Trala - Violin by Trala is a music learning app that is designed specifically for Violin users.
Flat - Online collaborative music score and tab editor, accessible from any device
Simply Piano - Fast and fun way to learn piano
Transposr - A free and simple way to transpose your sheet music or MP3.
Yousician - Learn to play music at home, at your own pace