The platform and the app and the system are sifferent things of course. That Redhat 7.1 distibution was probably tweaked, and running on an SGI Onyx Vector Supa-Doopa Laserlight Workstation.
I know that that recent film with the animated white mouse and the film Ice Age were donw using our nearest and deares gimp
. Another good raytracer is povray
. Those are the free ones I know of, but I'd be interested to hear of any more.