HDR Light Studio Alternatives

YafaRay is a free open-source montecarlo raytracing engine released under the LGPL 2.1 license. Raytracing is a rendering technique for generating realistic images by tracing the path of light through a 3D scene.

NOX Renderer is a rendering software based on unbiased methods.

3D rendering software for architects and designers. Maxwell is legendary for its quality and realism, and delivers great results via a simple set-up, which lets you focus on lighting.

Indigo RT is a new rendering solution which delivers unmatched value in the high end rendering market.

High performance physically based renderer.

Maverick Studio is a GPU-accelerated render engine for engineers, designers and artists.

Visual Designer is an advanced GPU & CPU photorealistic renderer with a unique set of features to handle all the aspects of your creation. It will save a significant amount of time and let you concentrate on refining your designs & arts aesthetics.

MiniLight is a minimal global illumination renderer. It is primarily an exercise in simplicity. But that makes it a good base and benchmark (in some sense) for development and experimentation. And it just might be the neatest renderer around (on average, about 650 lines).

3Delight is a fast, high quality, RenderMan®-compliant renderer designed to produce photo-realistic images in demanding production environments.

mental ray® is a rendering software which generates images of outstanding quality and unsurpassed realism. The software combines the physically correct simulation of the behavior of light with full programmability for the creation of any imaginable visual effect.