My recent submission:
Rove3D is an interactive production-quality renderer (pathtracer) for building applications with photorealistic graphics, using the same technology that is used in feature CG. The first version of the plugin is already finished and will be released for Unity soon, and I’m looking for funding to port the software over to Unreal Engine. It is cross-platform, and cross-vendor. More information can be found on the recent post to the Unity forums
Eye-candy from the beta: