Because Mac OS X is built on Darwin, which is base on FreeBSD, there is a possibility that cool programmer doodz will port the drivers over from a different OpenSource OS. I'm in the Darwin Developers group and was actually thinking about this. The problem is that I've never done anything like this before. Also the reason I would be doing it is to try and eventually find a way to use my iMac GameWizard card with it. The iMac uses the perch slot / mezzanine port which is not the same as a pci slot but similar. If it makes you feel any better the bottom line is I have a slim hope of getting my Voodoo 2 for the iMac working and you have a bigger hope of getting a PCI Voodoo 2 working, eventually that is. 3Dfx is cool though, maybe they will help us both out.
I found out about a 3Dfx driver for freeBSD. I haven't located it yet, but my source says that its in the Stable Tree for FreeBSD. Go over to ftp://ftp.FreeBSD.org/pub/FreeBSD/
and look around in there. Hope this helps someone out.