... slightly Indigo related ...
I know there is a Blender exporter for Indigo, but for my rendering comparisons I created a multi-exporter which currently exports simultaneously to 6 different scene descriptions (and more will follow):
.ass, .igs, .lxs, .mi, .mxs, .rib
Arnold, Indigo, Luxrender, mental ray, Maxwell, RenderMan compliant
http://www.janwalter.org/Download/PDF/f ... slides.pdf
It's not production ready, not tested on Windows (at all), but works fine for me (on OS X and Linux) and the source is free, can be cloned, can be made more production ready etc. etc. ...
In other words: Feel free to do whatever you want with it (feedback would be nice, participating in the rendering forum would be nice) ...