It seems that the satin snow ground glass is no longer available.
I saw a product in the new products for super bright ground glass, but I saw no resolutions in the thread it if was good or not.
All the ground glass questions seem old.

I am wondering what people recomend for the best ground glass for a 4x5 camera. Is there a trusted vendor who creates exceptional ground glass?
I have 2 Calumets, with one more on order, but I don't think the brand matters, as far as I can tell.

Second, I see that some ground glasses have clipped corners. I remember reading once that there is value in that, but I forget what it does for you to have the corners clipped. What is the advantage to clipping the corners of the ground glass?

I also see that people use Fresnel lenses with their ground glass. Are there ground glass Fresnel lenses (which is to say, the ground glass itself is a fresnel lens)?