Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
Slackbox - Spotify playlist collaboration through Slack
Your 2017 Wrapped by Spotify - Relive all the music you discovered and loved in 2017.
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Spotify - Map shows when two people play same song at same time
Exportify - Export your playlists from Spotify