Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
SpotMenu - Spotify and iTunes in your macOS menu bar
Magic Playlist - Get the playlist of your dreams based on a song
Audio Habits - See your top artists and tracks on Spotify
Spotify - Map shows when two people play same song at same time
Stapp - Stapp is a powerful tool that allows you to block all the tracks, artists, and albums that you do not like on Spotify just by adding them to the blacklist.