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
discoverlocal.fm - Find and listen to artists performing near you this week 🎶
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Poolside FM for Mac - An infinity pool of summer sounds in your Mac menu bar