I installed Ubuntu on an old Compaq deskpro PIII machine which I'm using for my CNC mill project. Very nice, and I'll probably switch to it on my desktop machine if/when the borg stop supporting Windows 2000.
Runs very well indeed. I downloaded it as a disc image alongside EMC2- E
ontroller 2, which is a free program designed for controlling almost any kind of machine, but is mostly used for CNC machinery, chiefly mills.