Spotalike - Spotify playlist with similar songs, according to Last.fm
Beata - For discovering the best new music from around the web
MusaicFM - An iTunes like screen saver based on Spotify and Last.fm
avant.fm - Avant.fm provides a customizable, listenable feed of new releases from the best indie record labels, across all genres.
Bowtie - Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify...
CLiGGO MUSIC - CLiGGO MUSIC provides free music enjoyment on your pc, smart phone or tablet.