Heartbeat - Listen to music with your friends together, on Spotify
SubmitHub - SubmitHub makes it easy to contact music bloggers, Spotify playlisters, record labels and more. We give you all sorts of statistics and ways to filter who to send your music to.
Liyo - Stream your favorite music live with friends 🎶
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
Partyhero - Pass your friends the aux!
Spotalike - Spotify playlist with similar songs, according to Last.fm