MusicTwin Finder - Find your MusicTwin by your Spotify playlists in 5 seconds.
JamBuddy - Find and collaborate with musicians around you thru Spotify
SoundCloud Charts - The most played tracks on SoundCloud this week
Stereofox - Find awesome new music, explore artists & create playlists
Playlist Machinery - Tools that help you create & organize your Spotify playlists
PlaylistMap - Connect with Spotify playlist curators from around the world