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I got a six sigma green belt using minitab in ~2018. It's still in use and getting updates, for example they now provide an interface to python: https://pypi.org/project/mtbpy/

Minitab had a good SPC toolbox back in the day.

For the longest time, open source solutions were incomplete in the sense that all of them did x-bar/S/R and then usually never got to the more esoteric but handy stuff. Multivariate, even less support.

I had the privilege of working at a JMP shop! It still gives me the warm and fuzzies.

My uni had its manual in its library is all I can say :)