Rhinoceros - Download
Evaluation Programs  
This fully functional version of Rhinoceros will save 25 times. After that it is still functional except it will not save. The evaluation version also supports plug-ins.

Rhino Evaluation (29.3MB)

Flamingo brings advanced raytrace and radiosity rendering to Rhino. This is a fully functional version except it has limited materials, light fixture, and plant libraries, and it also draws thin black lines across the final rendered image. Flamingo Evaluation (7.7MB)
Penguin brings freehand sketching, watercolor painting and cartoon-like rendering to Rhino. Penguin is a conceptual, sketch and cartoon, non-photometric scan line renderer. With Penguin you can create stylized images of your models with an artistic look for enhanced graphic and visual appeal.
Penguin Evaluation (3.6MB)