SKWHEEL - Scale/Key Transposing Wheel and Player.
Ever have trouble transposing notes or finding a related key? Need to know the chords for a key? Or a scale? SKWHEEL allows you to pick a concert key and set a corresponding transpose key, showing the scale degree, and play a specific chord, scale, or note.
Also:
Play and study scales
Play and study chords
Play individual notes (sandbox)