Firestarter is an easy-to-use free firewall tool for Linux that has a wizard that allows you to customize your firewall, a real-time firewall monitor that allows you to view intrusion attempts, a graphical interface that works under GNOME and KDE, and support for Linux kernels 2.4 and 2.6. Firestarter is one way to set up your system so that it is protected from intrusions.
Size: 7.43MB
Kerio Personal Firewall (KPF) helps users control how their computers exchange data with other computers on the Internet or local network.
Size: 600KB
Look 'n' Stop Lite is a free Windows firewall that filters inbound and outbound traffic from your computer.
*Note that this is a 30 day free trial.