Party Blends - A way to blend your friends favourite tracks into one Spotify playlist.
Slackbox - Spotify playlist collaboration through Slack
PeekaBeat - Turn your selfie into Spotify playlist 🎶
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Spotify Taste Rewind - What your music taste would have been like in past decades
Exportify - Export your playlists from Spotify