ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
keezy - A colorful soundboard. Play with music.
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
7Pad Scales and chords - Music instrument and assistant for playing scales and chords.
Splice - Music creation, collaboration, and sharing made simple.