Magic Playlist - Get the playlist of your dreams based on a song
PeekaBeat - Turn your selfie into Spotify playlist 🎶
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Party Blends - A way to blend your friends favourite tracks into one Spotify playlist.
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
Slackbox - Spotify playlist collaboration through Slack