Aqsis

Aqsis is “a cross-platform, photorealistic, 3D rendering solution, adhering to the RenderMan interface standard defined by Pixar Animation Studios.

“Focusing on stability and production usage, features include constructive solid geometry, depth-of-field, extensible shading engine (DSOs), instancing, level-of-detail, motion blur, NURBS, procedural plugins, programmable shading, subdivision surfaces, subpixel displacements and more.”