Lazyset - A Spotify playlist mixing Facebook Messenger bot
Spotify - Map shows when two people play same song at same time
Party Blends - A way to blend your friends favourite tracks into one Spotify playlist.
Spotify Taste Rewind - What your music taste would have been like in past decades
22tracks - DJ curated Spotify playlists on iOS
DiscVibe - Create personalized and contextualized Spotify playlists