HackUser.com - Computers: Security: Virtual Private Networks: Products and Tools: Open Source

Linux FreeS/WAN Project - An opensource project and software package for creating IPsec VPNs to and from Linux machines.
Linux IP Tunnel Mini-HOWTO - Instructions on how to setup a IP tunnel under Linux
Linux VPN HOWTO - Setting up a VPN with ssh and ppp.
Linux VPN Masquerade HOWTO - How to configure masquerading of IPsec and PPTP VPN traffic.
Linux-Sec: VPN Page - Collection of Linux VPN HowTos and free software.
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.
OpenVPN - SSL/TLS based user-space VPN. Supports Linux, Solaris, OpenBSD, FreeBSD, NetBSD, Mac OS X, and Windows 2000/XP.
OpenVPN GUI - A Windows GUI for OpenVPN. Gives a systray icon with a menu to control OpenVPN.
PPTP_GUI Home - A graphical user interface to the pptp-client software for Linux and BSD.
PPTP-linux client - Linux, FreeBSD and NetBSD client for the proprietary Microsoft Point-to-Point Tunneling Protocol, PPTP.
Secure Forwarding of Services with SSH - Contains ssh-ppp Perl script to set up a VPN.
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.

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