Kerkythea is a good package, with an excellent bunch of experts who are very helpful on the forum. For those who know how to use it will provide superb results & decent output for the rest of us! If you want pay a little money, Twilight Render provides an easier front end to the Kerkythea engine, with a template based workflow.
Never tried, but there is a plugin for the POV-RAY rendering package created by Didier Bur. I see the POV-Ray package bundled with engineers lighting calculation software.
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