OpenVPN

"OpenVPN <http://openvpn.net/>, our Bossie winner for best SSL VPN, is the open source champion of secure connectivity. OpenVPN simply outshines its competition. It can be used to secure site to site links, remote access connections, and Wi-Fi networks, providing load balancing and fail-over capabilities. It runs on a wide range of operating systems and is supported by numerous open source projects and commercial products. And OpenVPN supports all ciphers and key sizes supported by OpenSSL, giving it tremendous flexibility."

-- Tom Bower, InfoWorld -- September 2007