arViewportRender gives lighting artist the ability to make use of mayas standard render view in a more artistic and practical way. It has been used in two feature film productions and the feedback so far was really great.
Unfortunately it is only for Maya using Solidangles Arnold renderer.
It is fully Qt based and NOT a standalone frame buffer. Its a redesinged "render view"
The basic concept is from therenderblog.com
Download here: bitbucket.org/arutils/arutils/wiki/Home