ChordPic - Create beautiful guitar chord diagrams
ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
Strike a Chord - Master the piano with this inventive new app 🎹
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
ChordHelper - ChordHelper is a web app that helps musicians of any level make chord progressions from scratch, without having to know any music theory.
7Pad Scales and chords - Music instrument and assistant for playing scales and chords.