SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Beatport - Beatport is an online music store specializing in electronic dance music and culture.
keezy - A colorful soundboard. Play with music.
Spotify - Map shows when two people play same song at same time
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
Publiseer - Publishing should be free and easy