Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins
Magic Playlist - Get the playlist of your dreams based on a song
Pacemaker - Create and share mixtapes with friends
SpotMenu - Spotify and iTunes in your macOS menu bar
Boil the Frog - Create a seamless playlist between any two artists