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.
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Spotalike - Spotify playlist with similar songs, according to Last.fm
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧