- About.com VPN directory - A smattering of VPN resources including a glossary and a self-test.
- Corecom VPN FAQ Page - Geared towards those new to VPN.
- How Stuff Works: How Virtual Private Networks Work - Gives definition of VPN and an overview of general VPN topics, includes diagrams and an animation.
- NW Fusion: Research: VPNs - A collection of VPN resources and articles.
- Tom Dunigan's Virtual Private Networks page - This page describes IP-based VPN technology over the Internet
- Virtual Private Network Consortium - VPNC is the international trade association for manufacturers in the VPN market.
- VPN labs - research community - VPN labs is an open community for researching, reviewing, and discussing Virtual Private Networks.
