Flowkey - The easiest way to learn piano with your iPhone or iPad
Plantoost - Plantoost is an online learning and teaching platform where educational content creators share their knowledge and make a living doing what they love.
Yousician - Learn to play music at home, at your own pace
Coursera - Build skills with courses, certificates, and degrees online from world-class universities and companies
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
TrainingSeeker - Finding training just got easier