soundrop - Soundrop is an app that allows you to create your own personalized sound track to keep you focused or relax.
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.
Chord Generator - Used to draw guitar chord images.