SABnzbd is a cross-platform binary newsreader. It makes downloading from Usenet easy by automating the whole thing. You give it an NZB file or an RSS feed, it does the rest. Has a web-browser based UI and an API for 3rd-party apps. Ideal for servers too.
Easily download your newsgroups binary files with this small GTK+ application to control your HellaNZB daemon. It's well integrated into your desktop: in a few clicks you can monitor and manage your remote (or local) queue.