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Links
- PPTP-linux client

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

A graphical user interface to the pptp-client software for Linux & BSD.
http://pptp-gui.sourceforge.net
- Secure Forwarding of Services with SSH

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

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/
- Unofficial FreeS/WAN Site

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
- OpenVPN GUI

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

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

Setting up a VPN with ssh and ppp.
http://www.tldp.org/HOWTO/VPN-HOWTO/
- Linux IP Tunnel Mini-HOWTO

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

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

Collection of Linux VPN HowTos and free software.
http://www.linux-sec.net/VPN
- OpenBSD - Secure Free Operating System

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/
- Linux FreeS/WAN Project

An opensource project and software package for creating IPsec VPNs to and from Linux machines.
http://www.freeswan.org/
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