Important Notice: Flamingo has been replaced by the new advanced renderer built into Rhino.
Flamingo nXt adds many features such as decals (a specific type of texture mapping), more advanced materials, large material libraries and also a plant generator.
AccuStudio - Lots of free objects, materials, plants and textures.
DOSCH DESIGN - Architecture, 3D models, scenes, textures and images.
These test commands are intended for internal development use, but may be helpful in some specific situations. They are not documented.