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.
The Eternal Jukebox - For when your favorite song just isn't long enough
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
The Wub Machine - Turn any music into Dubstep, Drum & Bass, and more.
Spotalike - Spotify playlist with similar songs, according to Last.fm
YOU.DJ - Mix SoundCloud music and Youtube videos live in your browser.