I've got an old #cisco #ASA 5512-x laying around that I figured might come in handy some day.
My brother recently sent me an article to a fellow who got #opnSense running on it, and of course I had to bite.
It was almost too easy! I tracked down an ancient VGA to IDC connector, installed it on the motherboard, and then changed the BIOS around to boot from a thumbdrive. OpnSense installed without issue, and BAM I have a 7-port gigabit router with a #xeon processor, 8GB of DDR3 and a 128GB SSD.
I haven't tested yet, but supposedly these bad boys can push *almost* full line speed.
Not too bad for free! It appears these can be had online for under $50 all day long.