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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
VTun is the easiest way to create Virtual Tunnels over TCP/IP networks with traffic shaping, compression, and encryption.
It supports IP, Ethernet, PPP and other tunnel types. VTun is easily and highly configurable.
VPN, Mobile IP, Shaping, etc
Network link bonding/trunking/aggregation and multichannel VPN daemon
...Supports python plug-ins for new algorithms implementation. Open source version developed and commercial support provided by Vrayo Systems, http://vrayo.com. No encryption supported yet.
Campagnol is a decentralized VPN over UDP tunneling. It uses UDP hole punching to open connections through NAT/firewall and OpenSSL's DTLSv1 implementation for mutual authentication and encryption.
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Extremely simple VPN designed to be used for 'pinch' situations requiring a VPN 'now', without fiddling with encryption keys, compression settings, and authentication. Not designed for permanent use.