Spotalike - Spotify playlist with similar songs, according to Last.fm
Heartbeat - Listen to music with your friends together, on Spotify
MusaicFM - An iTunes like screen saver based on Spotify and Last.fm
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Bowtie - Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify...
Join My Playlist - Listen to music live together with your friends in Spotify.