Until AM - DJ in your browser with this SoundCloud music mixer
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
Songlio - Free musical guessing game: race friends to name that tune
Musicroamer - A visual Pandora for discovering new music
Playlistify - Make Spotify playlists from 1001tracklists & setlist.fm sets
TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.