I don't know of Mac-Specific networks, but Acquisition is a great piece of software using the Gnutella Nework.

I do call it the best designed file-sharing client avaible for any system.

Look for it at http://acquisitionx.com.

It doesn't have spyware or adware, but it has an unnerving nag-screen.
It uses the Limewire Core with a great interface by Porf, the interface designer.

Gnutella makes quite much Mac-Software and other tools for Mac avaible. Just add "dmg" to the search-string and you'll find only Mac-Software.

You could also use phex on the Mac, which isn't as beautiful as Acquisition, but also works decently and is a real downloading machine, a workhorse, where Acquisition is the fine tool to get the files you want elegantly, but not always as reliable.

And don't forget to share!

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