My setup is: Beige G3 300 (rev a with rev c rom), built-in RageII+ (ugh), 2 Voodoo2s in SLI, 288mb ram.
I know that Omni has developed Voodoo2 drivers, an OpenGL component for these drivers, and Q3, all for OS X. On their website they imply that this combination would work for playing Q3...