Metronaut - An app to help you play classical music
Flat for Education - The best way to teach music to your students
Musopen - Unlimited royalty free music sheets, tracks and textbooks 🎶
Flat - Online collaborative music score and tab editor, accessible from any device
tonestro - Practice & improve on your wind instrument while having fun
MuseScore.org - Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore. For Windows, Mac and Linux.