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.
Momixa - Pick two songs and get the perfect mix
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins
Spotalike - Spotify playlist with similar songs, according to Last.fm
Pacemaker - Create and share mixtapes with friends