Technologies used for creating secure VPNs. Various standards and protocols listed with links to related RFCs.

Stunnel - Universal Secure SSL Wrapper.

This document gives you the details how to setup a virtual private network between Linux/Openswan on one side and Microsoft Windows 2000 and XP on the other side.

ERT Group - Experts in Microsoft Dynamics.

An IETF group working on PPP's extensions.

CISCO's Layer Two Forwarding protocol

An IPsec reference implementation for Linux.

Virtual Private Network Consortium -- VPNC

OpenVPN GUI is a graphical front-end application for OpenVPN on Windows. It gives you an icon in the system tray from which you can control OpenVPN.

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.