Yafaray?

[Steffen]

I didn't try it yet, so cannot answer the question if it can run standalone.
But its images look promising, so if you want to run it from inside Blender,
then maybe this recent LDRAW Blender importer is useful for you:
https://github.com/le717/LDR-Importer
I suggest using the latest greatest unstable master version, not the previous release 1.1,
because some important bugfixes just occured
https://github.com/le717/LDR-Importer/is...ate=closed
and some are in the pipe
https://github.com/le717/LDR-Importer/issues
.