[gh02t]

Not sure if it can run BSD proper. It should be able to in theory, there's nothing preventing you from flashing your own OS image, but I can't find that anybody has actually done it. There is a facility for virtualization as well. Not sure how desirable it'd be to run on bare metal though, as it uses dedicated hardware for routing that I think is proprietary, so it wouldn't work. If I was going to try it, I'd probably pick up one of their cheaper products first to test it out on (most of the lower end stuff is similar internally).

I'm with you about the GPL though. It's my biggest complaint about it. Apart from the proprietary hardware (which OK, I guess I can forgive it), they definitely seem to be playing it pretty loose with the terms of the GPL.

Pf is indeed nice and it'd be cool to run OpenBSD on it. That said, as I mentioned I really like their configuration tools and they make iptables actually quite easy to configure.

Your best bet for a BSD router is probably to pick up a cheapish computer and put in one of the Intel or HP quad-port ethernet cards and then plug into a dumb switch. They can be had for surprisingly reasonable prices, I saw some on Amazon for ~$80 (the quad-port cards, that is).