Thanks mfgenggear!
I really enjoyed these sites. I've seen a 66 MHz precessor requirement, pages last updated in 2015, DOS programs, DXF version 12. It was a nice experience, bringing back memories from the past. The spreadsheet (or, as it turns out, a little exe file) was just one of the things I remembered about that post I was looking for.
It's interesting to see a program completely ignoring the trochoid section of the tooth, simply replacing it with a straight line, which may lead to serious interference related problems, making that gear profile unusable. The program is online for so many years and no one ever complained?