Any material editor supporting DSPBR?

[cesss]

I'd like to give DSPBR a try. Do you know of any application that lets you tweak all parameters defined by DSPBR and see an interactive preview of the material?

[Renderking]

Dassault Systems DeltaGen, from 3DExcite brand, utilizes the DSPBR and lets you tweak all parameters and see it interactively in the Stellar Render in Rasterizer, Whitted Raytracer or Pathtracer (GI) mode.
You can request a Trial version here .
You need to request DeltaGen Stage in order to have the GI renderer capability.