YWAM Information Technology

Here is a pretty good article on PFSense, a firewall based on FreeBSD. PFSense is more feature rich than SmoothWall and has some awesome features, such as out of the box support for OpenVPN. I have PFSense running on an old Dell computer, but I have read of some very large installations using PFSense to support very large networks.

The cost is free and is certainly well worth taking a look at.