mayaToFuji implements an interface to a new renderer called fujiyama. It is created by Hiroshi Tsubokawa. The renderer already implements very interesting features like volume rendering, motionblur, subsurface scattering, hair rendering and indirect illumination. I'm very proud to be able to work on a maya interface for fujiyama.
As for the other interfaces, the sources are available on github. The discussion group is available here.