I don't use P2P software, but LimwWire is now Open Source and is available
for Linux.
http://www.limewire.org/
,----[ Quote ]
| We believe that the Gnutella Network could be and should be one of the
| core distribution tools on the Internet. We believe in open standards,
| open networks, and that any global networking protocol must have an open
| source piece at its core if it is to remain uncorrupted. We believe that
| the best people to develop the Gnutella Network and its applications are
| its users.
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