Absolutely fantastic firewall system with a well-designed GUI and support for plugins. This does everything I used to do from a custom FreeBSD or OpenBSD build with a number of packages installed. It supports NAT and elaborate firewall rules, with stateful rules, DNS forwarding, optional web cache, pretty much you name it. These days, going on the Internet without protection can be disastrous, especially from a Windows machine. This is your protection - put it between all your PCs and the Internet connection.