Tempso - Finally a place for classical music online!
Metronaut - An app to help you play classical music
musicForProgramming(); - Mixes intended for listening while programming
Flat - Online collaborative music score and tab editor, accessible from any device
Music-Map - The Music-Map is the Tourist Map of Music, part of Gnod, the Global Network of Discovery.
Flat for Education - The music education platform your students will love