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SigmaVPN is a light-weight VPN solution aimed at providing easy-to-configure and secure VPN tunnels for UNIX systems.

• SigmaVPN is modular. It is very easy to create new interfaces and encryption/encoding schemes.
• SigmaVPN is slim. It's just a few hundred lines of pure C.
• SigmaVPN is easy to configure, allowing you to put settings for multiple tunnels into just one configuration file.

Documentation:

• Introduction: An introduction to SigmaVPN, and some basic concepts.
• Compatibility: Supported operating systems and compatibility information.
• Building: Instructions on building the latest bleeding-edge SigmaVPN from source.
• Configuration: Details about the configuration format and supported options.
• SecureTunnelHowto: A guide on creating a secure nacltai tunnel over UDP.

See also:

• SigmaVPN for Android
• Google Code
• Sourceforge