Heartbeat - Listen to music with your friends together, on Spotify
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Magic Playlist - Get the playlist of your dreams based on a song