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.
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
Music Suggestions Ninja - Enter an artist's name & find similar, lesser known artists
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
RYSE UP - Connecting up-and-coming artists with the world's top talent