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An opensource project and software package for creating IPsec VPNs to and from Linux machines.
site exerpt
FreeS/WAN Project: Home Page  N team is proud to announce the arrival of 2.06, the project's final release of its freely redistributable IPsec for Linux. Here are a few of its notable features, as documented in the CHANGES file: KLIPS has been ported to...
http://www.freeswan.org/

OpenBSD aims to produce a free, secure multi-platform operating system that integrates strong cryptography including a current and complete IPSec implementation.
http://www.OpenBSD.org/

Instructions on how to setup a IP tunnel under Linux
http://linas.org/linux/iptunnel.html

Collection of Linux VPN HowTos and free software.
http://www.linux-sec.net/VPN

A GPL'd port of Sun Microsystems Simple Key management for Internet Protocols
http://www.tik.ee.ethz.ch/~skip/UsersGuide.html

Contains ssh-ppp perl script to set up a VPN.
http://csociety.ecn.purdue.edu/~sigos/projects/ssh/forwarding/

Linux, FreeBSD and NetBSD client for the proprietary Microsoft Point-to-Point Tunneling Protocol, PPTP.
http://pptpclient.sourceforge.net/

Creates an encrypted Virtual Private Network, or VPN, between two Tunnel Vision-capable sites on the Internet. Authentication is made as secure as possible by sending encrypted passwords first-time, and never thereafter.
http://open.nit.ca/tunnelv/

A self-contained VPN solution designed to connect multiple sites together in a secure way. Runs on Linux, FreeBSD, OpenBSD, NetBSD, MacOS/X, Solaris, Windows 2000 and XP.
http://www.tinc-vpn.org/

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.
http://www.freeswan.ca

A graphical user interface to the pptp-client software for Linux & BSD.
http://pptp-gui.sourceforge.net

Setting up a VPN with ssh and ppp.
http://www.tldp.org/HOWTO/VPN-HOWTO.html

How to configure masquerading of IPsec and PPTP VPN traffic.
http://www.tldp.org/HOWTO/VPN-Masquerade-HOWTO.html

A Windows GUI for OpenVPN. Gives a systray icon with a menu to control OpenVPN.
http://openvpn.se/

SSL/TLS based user-space VPN. Supports Linux, Solaris, OpenBSD, FreeBSD, NetBSD, Mac OS X, and Windows 2000/XP.
http://openvpn.net/