I went to download hwinfo64 and Memtest86 and found that the software is not Free. They seem to have become “freemium” or “freeware” with lots of ads for upgrading to paid versions.
I’m sorry, I was asking about, “free and open-source” software. It appears that Hwinfo64 and Cpu-z have always been closed source. I might take a look at Cpu-X?