Magic Playlist - Get the playlist of your dreams based on a song
Poolside FM - Experiment a radio made on Internet times.
Spotalike - Spotify playlist with similar songs, according to Last.fm
PoolChat - A '90s chat room experience from Poolside FM & Zyper
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Playmoss - Create playlists from YouTube, Vimeo and SoundCloud