merlin/        contains a pre-release demo of Merlin 1.04, a quite
               capable commercial raytracing package
povray-2.2/    port of PovRay 2.2
povray3/       port of PovRay 3
ray3d-pro.spk  v2.10(d) (DEMO version) - modeller to create scenes for
               the Rayshade v4.0.6 raytracer