Playlist Machinery - Tools that help you create & organize your Spotify playlists
Stereofox - Find awesome new music, explore artists & create playlists
Heartbeat - Listen to music with your friends together, on Spotify
JamBuddy - Find and collaborate with musicians around you thru Spotify
Partyhero - Pass your friends the aux!
Gymspiration Bot - Random gym exercises in a gif for every muscle group