Software engineering in Canada in the 2000s. Most of the labs in my university ran Linux, at least in the engineering, math, and science areas of campus.

Personally I ran, depending on the year, LFS (Linux from Scratch), Slackware, or Gentoo (which still lives on that laptop today but also it hasn’t been booted or connected to a network in like 10 years).

I think there was only one lab with Windows. We also had a lab of Solaris machines but I bet those are gone now.

No idea what Law, Nursing, and other faculties in the other side of campus used.

This might not be super useful if you don’t write code but I always found the contest submissions fun to read and try to figure out for the https://www.underhanded-c.org/ contest.

They break down and explain the runner up and finalist for each year and how the attack works. It’s usually something very subtle that most people wouldn’t catch.