It’s widely used in the EDA (chip design) industry. (Unfortunately)

Printer

Well, my beard is the right colour… But none.

I had an Acorn BBC B (running Acorn MOS), then an A3000, A5000, RiscPC (all with RISC OS), then I switched to Linux. I have occasionally used DOS and Windows at work, but never as my main home OS. (I write Linux software for work, but do use a windows laptop to connect to my Dev box)

I love fairemail. I had an issue with some mails I was getting regularly not rendering properly and the guy was so helpful that I donated again even though I already had the paid one (which confused him!)

Aquariums. I don’t have one of my own but love to see pictures of other people’s.

I gave up on owncloud just before it became nextcloud because it kept breaking every time I updated it.

Wallabag is similar for me now. I’m stuck on a slightly out of date version because I can’t get newer ones to run. Everything else I self host is painless though.