[jamesmp98]

I've started learning Erlang recently and I'm enjoying it. Ada and Forth have also intrigued me too, but idk if either of those are obscure

[beckler]

I did some Ada in college. It's incredibly powerful, but it can be pretty difficult to work with. I don't know where else is used other than aviation and the military.

[randomsearch]

+1 for Ada. Loved they way it made tasks and monitors etc explicit. Easy to work with low level hardware. Liked the subtyping too. Often compilation => correct.

[sa46]

Ada was the intro programming language at my college and I have a soft spot for it.