Light Tracer Render 2.0 is out and import CAD file such as IGES and STEP, and now has a new features for better caustics with path guiding and works well inside browser and seem very cheap than other render excepts the freeware ones like LuxCoreRender and Cycles inside Blender :)
https://lighttracer.org/

Maybe also this thing if you have an Ipad! (Maybe a day on android ?)
Less 10 € ! That is some amazing!

This is a fantastic tools if you have an Ipad.. without 3D application for UV mapping, with CAD files you can't do much as said in the video.