Kerkythea
Kerkythea is a standalone rendering system that supports raytracing and Metropolis light transport, uses physically accurate materials and lighting, and is distributed as freeware. Currently, the program can be integrated with any software that can export files in obj and 3ds formats, including 3ds Max, Blender, LightWave 3D, SketchUp, Silo and Wings3D. == History == Kerkythea was preceded by Phos, an experimental rendering engine developed by Ioannis Pantazopoulos during his research at the National Technical University of Athens (NTUA).