FStormRender is a new GPU powered, unbiased render with good performance / quality trade. It is very simple, fast and realistic with convenient materials and light sources.
Corona Renderer is a new high-performance (un)biased photorealistic renderer, available for Autodesk 3ds Max and as a standalone CLI application, and in development for Maxon Cinema 4D.
Corona Renderer 2 for 3ds Max was recently released, with Corona Renderer 3 due soon.
CGTricks.com is a synthetic source of learning on all aspects of 3D Architectural Visualization.