Your 2017 Wrapped by Spotify - Relive all the music you discovered and loved in 2017.
Magic Playlist - Get the playlist of your dreams based on a song
SpotMenu - Spotify and iTunes in your macOS menu bar
Spotalike - Spotify playlist with similar songs, according to Last.fm
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.
Playlist Machinery - Tools that help you create & organize your Spotify playlists