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OpenBSD - Secure Free Operating System - http://www.openbsd.org/
OpenBSD aims to produce a free, secure multi-platform operating system that integrates strong cryptography including a current and complete IPSec implementation. |
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OpenVPN - http://openvpn.net/
SSL/TLS based user-space VPN. Supports Linux, Solaris, OpenBSD, FreeBSD, NetBSD, Mac OS X, and Windows 2000/XP. |
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Linux FreeS/WAN Project - http://www.freeswan.org/
An opensource project and software package for creating IPsec VPNs to and from Linux machines. |
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Unofficial FreeS/WAN Site - http://www.freeswan.ca
Home of Super FreeS/WAN, ZeeS/WAN and FreeS/WAN + X.509 packages, as well as interoperability documentation and patches for additional features and broader compatibility. |
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PPTP-linux client - http://pptpclient.sourceforge.net/
Linux, FreeBSD and NetBSD client for the proprietary Microsoft Point-to-Point Tunneling Protocol, PPTP. |