Another one like this is (was? not sure if it's maintained any more) Lux Render: https://luxcorerender.org/ https://luxcorerender.org/ I played my part in this

Another one like this is (was? not sure if it's maintained any more) Lux Render: https://luxcorerender.org/ https://luxcorerender.org/ I played my part in this back in the 2010s maintaining the blender integration, fun times :) But both the renderer and the integrations got pretty much entirely re-written in the move to GPU compute shortly after that time.