Cisco 2800 Series 2811 or 2821
I have access to a bunch of these devices real cheap. Will pfSense install on them? I've googled but I can't seem to find out what processor they are using.
Too bad :( Off to look some more
For this CPUs inside Cisco is writing their own Code and Firmware called Cisco IOS.
So I am really sure that you wouldn´t be able to run pfSense on this machine.