SoftEther VPN ("SoftEther" means "Software Ethernet") is a powerful,
multi-OS and easy-to-use multi-protocol VPN software. It supports
SSL-VPN (HTTPS), as well as OpenVPN, IPsec, L2TP, MS-SSTP, L2TPv3
and EtherIP tunneling protocols and has a clone function to support
OpenVPN clients.

WWW: http://www.softether.org