I don't know what made me think of it, but is the NISAT 6 axis controller still available? If you want a high end system for free, try that one, if it's even still around. I remember running accoss it years ago, atleast 5 years, only catch is it runs under Linux, and I highly doubt it has a support forum such as Mach, but what other company does? It was supposed to set the standard for PC controllers, issued by the NISAT, and was free to download, fully functional. Does anyone remember this or even know what I'm talking about?
Michael