Max to Sunflow Exporter
This script exports Max scenes for use with the open source renderer Sunflow (http://sunflow.sourceforge.net/). It supports all of the Sunflow shaders, geometry, lights, HDRI, particle systems, GI and photon settings, sampling, bucket setup and camera settings.
The main script (max2sunflow025.mse) goes in the main Scripts folder (usually C:\Program Files\Autodesk\3ds Max 9\Scripts)
The macroscript (max2sunflow.mcr) goes in the macroscripts folder: C:\Program Files\Autodesk\3ds Max 9\ui\macroscripts
The 4 icons (*.bmp) go in the icons folder: C:\Program Files\Autodesk\3ds Max 9\ui\Icons
Now start Max, go to Customize -> Customize User Interface... and add the macroscript
to a toolbar or menu of your choice (I always use the 'Extras' toolbar for my bits and pieces)
If you are going to be exporting a lot of particles, or very heavy scenes, it night be an idea to increase the memory allocation for MAXScript. You can do this by going into the 'Customize -> Preferences... -> MAXScript' settings, and increasing the 'Initial heap allocation' setting. I've got mine set to 64MB.