BeatMix - Enables Shuffle and Radio for multiple artists in Spotify
Magic Playlist - Get the playlist of your dreams based on a song
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Spotalike - Spotify playlist with similar songs, according to Last.fm
Thank You DJ - Personalized, Data-Driven experience for your guests.
Spotify - Map shows when two people play same song at same time