Visualify - Visualize your top artists on Spotify
SubmitHub - SubmitHub makes it easy to contact music bloggers, Spotify playlisters, record labels and more. We give you all sorts of statistics and ways to filter who to send your music to.
Kaleidosync - Kaleidosync is an all-in-one Spotify music visualizer that is all set to deliver a top-notch music experience with real-time support.
Spotalike - Spotify playlist with similar songs, according to Last.fm
SYQEL - Bring your music to life
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧