Spotify Taste Rewind - What your music taste would have been like in past decades
Magic Playlist - Get the playlist of your dreams based on a song
Apple Music Analyser - Missing year in review? Apple Music Rewind?
Spotalike - Spotify playlist with similar songs, according to Last.fm
Teleport Sundial - Your remote team's locations, time zones and availability
Playlist Machinery - Tools that help you create & organize your Spotify playlists