appleseed is modern, open source, physically-based rendering engine designed
to produce photorealistic images, animations, and visual effects.

It provides individuals and small studios with an efficient, reliable suite
of tools built on robust foundations and open technologies.

Started in 2009, it has grown into a robust production rendering toolset and
has been battle-tested on several projects such as TV documentaries, ads,
promotional videos, and animation shorts.

WWW: https://appleseedhq.net/