I wouldn’t call either Wine or OpenBSD “obscure”. Most people haven’t heard of them, sure, but they’ve each been going for three decades and should be known (at the very least by name) by any person with an interest in computing for more than making money.

But of course, no one is born knowing, so here you go.

https://en.wikipedia.org/wiki/Wine_(software)

https://en.wikipedia.org/wiki/OpenBSD

You don't know what OpenBSD or WINE is? I'm afraid that is on you.