"free and open-source P2P Social Virtual Private Network (VPN) that seamlessly networks your computer with the computers of your friends so that:" http://socialvpn.wordpress.com/
"At FOSDEM 2011, on Sunday morning February 6, there will be three tinc related talks in the New challenges in Virtualization devroom:" "a Virtual Private Network (VPN) daemon that uses tunnelling and encryption to create a secure private network between hosts on the Internet. tinc is Free Software and licensed under the GNU General Public License version 2 or later. " http://www.tinc-vpn.org/
"n2n: a Layer Two Peer-to-Peer VPN" http://www.ntop.org/n2n/