Tycho Forecast - Turn your weather into a Spotify or Apple Music playlist
Undrtone - Social layer on top of Spotify and Rdio from Scott Vener
Plotify - Spotify playlists from movie plots 🍿🎶
PlaylistMap - Connect with Spotify playlist curators from around the world
Spotify - Map shows when two people play same song at same time
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!