The Internet Engineering Task Force
The Internet Engineering Task Force (IETF) is a large open international community of network designers, operators, vendors, and researchers concerned with the evolution of the Internet architecture and the smooth operation of the Internet. It is open to any interested individual. http://www.ietf.org/
FreeS/WAN Project
The FreeS/WAN project provides a free VPN solution for the Linux platform, allowing users to create an IPSEC/3DES virtual private network. http://www.freeswan.org/