Personal Gnutella Network/Server

I am at a college and the computer department has limited all P2P bandwidth out to the Internet (it works, but extreamly slow). A group of friends and I have decided that we need to setup our own P2P server to share files between the college residents that will use the LAN to transfer the files instead of the Internet connection.

Can anyone point me in the right direction on what software I would need to setup a Gnutella server (or anyother free P2P/MP3 sharing server).

Thanks