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
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 🎧
Boil the Frog - Create a seamless playlist between any two artists