ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
Defonic - Create a unique sound environment at home or in the office
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
Ruya - A calming space
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
Noizio - Feeling that the noise of the big city is too much for you to bear?