The main difference between this site and BitTorrent sites is, that it doesn't publish any links or similarto files. You don't need Serverbound trackers in the Gnutella network. Everything is integrated (except rating, because that would need trust...trust in any stranger out there).
This is solely about the network, not about the files, you can get through it.
You can find a Gnutella program here.
http://limewire.com,
or check at
http://gnufu.net for another list of programs.