RenderBoy is an integrated solids based 3D modeler and photo-realistic "ray-tracing" renderer for MacOS computers. What does that mean? Well, using RenderBoy's simple graphic user interface, you can create 3D designs in a truly what-you-see-is-what-you-get (WYSIWYG) point & click fashion. You can specify how design surfaces should look (dull, shiny, mirrored, color, texture, etc) and add working light sources to illuminate your design. Then, in one step, you tell RenderBoy to "render" it, which means create a photo-realistic image (or even an animation!) by mathematically tracing the rays of light around your design. You will get shading, shadows, refelections, refractions, glinty spots, even fog, and all of this is 100% automatic.
This software's licence is Shareware - Unlimited, which means that the current version is free of charge for now; no time or feature restrictions in this version.