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.
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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