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* POV-Ray.

The Persistence of Vision Raytracer, or POV-Ray, is a ray tracing program.

  http://www.povray.org/
                home page
  http://en.wikipedia.org/wiki/POV-Ray
  http://xahlee.org/3d/povray.html
  http://xahlee.org/3d/povray_emacs.html