I don't think I've ever seen a "Zoltar" game, but I've seen so many other games JUST like it that I wouldn't be suprised if it were real. I haven't seen anything online that pointed to them existing or not, but I did find this interesting link:
http://www.nvidia.com/view.asp?IO=demo_zoltar
It's na NVidia demo that uses Zoltar. Heh.