OpenVPN is a robust and highly flexible tunneling application that uses all of the encryption, authentication, and certification features of the OpenSSL library to securely tunnel IP networks over a single TCP/UDP port.
Discussion forums and project wiki can be found here:
https://forums.openvpn.net/
http://community.openvpn.net/openvpn
RAS-SMS is a simple extension to Microsoft's Remote Access Service (RAS). RAS-SMS adds two factor authentication to standard VPN/PPTP clients on Windows, Mac-OS and Linux. RAS-SMS uses your mobile phone instead of smart cards, RSA keys or USB tokens.