Vagalume is a Last.fm client for the GNOME desktop environment and the Maemo platform, used by the Nokia 770/N800/N810 Internet Tablets.
Grsync is a GUI for rsync, the command line file and directory synchronization tool. While it can work with remote hosts, its focus is to synchronize local directories.
A media library management system for obsessive-compulsive music geeks.
A CalDAV Web client.