Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Bowtie - Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify...
Maloja - Simple self-hosted music scrobble database to create personal listening statistics.
Muzzy - it’s a tiny and gorgeous iTunes companion that lives on your menu bar. For Mac OSX, its free!
Last.fm Scrobbler - Scrobble music all around the web!
Owlead - Grow your Twitter with valuable followers, effortless