Simple TDI-Based Open Source Personal Firewall for Windows NT4/2000/XP/2003
Brings the functionality of Linux netfilter to Windows.
Bootable CD Forensics/Virus Scanning/Recovery/PenTesting platform
PktFilter is a software that can configure the IPv4 filtering device driver found in Windows 2000/XP/Server 2003, with filtering rules following a syntax similar to IP Filter.
Implements a Windows NT VPN peer to Olaf Titz's CIPE VPN for Linux NOTE: The distribution must be downloaded from the home page
Linux Authentication Gateway which allows to make dynamic firewall rules based on usernames.
A complete network firewall for Windows systems. The main goal is create a powerful tool with the next characteristics: easy of use, modularity and flexibility.
KFW aims to be a simple to use but powerful Firewall/IDS. That will have a GUI designed since its origins, and will use state of the art firewalling and intrusion detection techniques to achieve maximum performance.
SmartDog is anti-spam,intrution detection software for windows/linux. And, it contains many features that are all requried by a normal user to network administrator. Visit to the home page for more clarity.
The Knock Project is a collection of security tools providing increased client/server authentication. The server and its functionality is provided by the netfilter kernel interface. Included are the daemon, a GNU/Linux client and a Windows client.
Amun is an open source firewall for windows 2k/XP systems written in C.