Earlier this year pixar released a free, non-commercial version of Renderman, their photo-realistic 3D rendering software used within the company's animated movies. Coming out now thanks to work by Pixar and the community is a Blender-to-Renderman exporter plug-in.

This plug-in, names PRMan-for-Blender, allows for using Renderman and Blender together with integration previously not possible. The Python-based plug-in for the Blender open-source modeling software can be found via this Git repository.