Esenthel Game Engine ( http://esenthel.com/ ) now has full support of PBR.

This includes realistic GGX specular, environment map, smoothness/roughness/gloss, reflectivity, multi-scattering energy preservation, Burley/Disney based diffuse shading.

It's a lot more advanced than the previous shading model!

Here's an example of new rendering:

And as if turned to metal:

And here's a slideshow comparing old vs new rendering system:

https://www.facebook.com/EsenthelEngine/photos/pcb.2777773715589925/2777771278923502/?type=3&theater

Esenthel is a very powerful, free, open source and cross-platform Game Engine.

Thanks!