I think Star Logo needs to not rely on Autodesk programs when it comes to custom sprites, and needs to be a little more simpler than it currently is. Is that possible, or are there super easy to use, no programming required, free, 3d game engines for windows?

You have to pay for autodesk.

Really good ones? None really.

Closest ones that come to mind are Blender - whose game engine relies on Python programming, and Unity 3D - which has a visual programming plugin which you can pay for.

yes, and youre on it right now