What is "yafaray"

YafaRay is a free, open source ray tracing program that uses an XML scene description language. It has been integrated into the 2.49 version of the 3D modelling software Blender, but required an exporter for the redesigned 2.5 version of Blender. It now has an addon to integrate it into blender 2.73.

It is licensed under the GNU Lesser General Public License (LGPL).