Discover on Demand - Just like Spotify's Discover Weekly, but whenever you want.
Heartbeat - Listen to music with your friends together, on Spotify
Rocketgraph - Rocketgraph is an open-source drop in replacement to Firebase, except it's much better.
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Spotify - Map shows when two people play same song at same time
Join My Playlist - Listen to music live together with your friends in Spotify.