Magic Playlist - Get the playlist of your dreams based on a song
PeekaBeat - Turn your selfie into Spotify playlist 🎶
Spotalike - Spotify playlist with similar songs, according to Last.fm
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Lazyset - A Spotify playlist mixing Facebook Messenger bot
Spotify - Map shows when two people play same song at same time