muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
ChordPic - Create beautiful guitar chord diagrams
Scale Heaven - Browse and play any scale/chord, chord progression.
Hyperlax - Sit back. Relax. Explore faraway places. Enjoy the music.
Noizio - Feeling that the noise of the big city is too much for you to bear?