Lazyset - A Spotify playlist mixing Facebook Messenger bot
Magic Playlist - Get the playlist of your dreams based on a song
Party Blends - A way to blend your friends favourite tracks into one Spotify playlist.
Spotalike - Spotify playlist with similar songs, according to Last.fm
PeekaBeat - Turn your selfie into Spotify playlist 🎶
Playlist Machinery - Tools that help you create & organize your Spotify playlists