Nebula Render 2 is a new commercial unbiased physically-based standalone render app created for architects, designers, and VFX artists.

Features include interactive raytracing, a 3d view to modify the scene and add helpers, support for common material types including subsurface scattering and participating media, post-processing editor, CPU, and hybrid GPU modes.

Features:

• Interactive raytracing. The realtime progressive raytracing mode allows users to interactively edit scenes and see a preview of the final result.
• Intuitive interface. The user interface comes with a collection of helpers to simplify scene manipulations, so you can modify different elements in a couple of clicks.
• Photorealistic renders. Nebula supports a high range of lighting effects to help users create stunning images.

You can learn more about the tool here.