PlaylistMap - Connect with Spotify playlist curators from around the world
Undrtone - Social layer on top of Spotify and Rdio from Scott Vener
Lazyset - A Spotify playlist mixing Facebook Messenger bot
SoundCloud Charts - The most played tracks on SoundCloud this week
Playlist Machinery - Tools that help you create & organize your Spotify playlists
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!