I wanted to say "languages you know (of), but the title length limit was 80 characters.
A more appropriate term for "obscure" may be "less well-known", in this context.
Lots and lots of assembly languages: 8080, Z80, 6502, 2650, 6800, 68000, 8086, and those are just the ones I can remember off the top of my head.
Pascal is becoming obscure, then there's its offshoot Oberon.
And it's been a very long time since I heard anything about ADA
I was a heavy Turbo Pascal user earlier, did some commercial and hobby work with it, and did some Delphi and FreePascal too.
The speed of operation of the TUI FreePascal IDE (similar to that of the Turbo Pascal IDE) blows IDEs like Visual Studio, IntelliJ,and Eclipse out of the water, after you develop just a little muscle memory for it.
Also, FreePascal binaries are quite small, and comparable to those created by C and D.
I had done a quick test of that a while ago, for small programs.
All were in the range of under 100 KB.
Not everyones cuppa tea but it's the language of choice for cheating at games. (Rust is coming up strong though).
Pawn (used in SAMP)
Or maybe SAKO, an ancient programming language with Polish keywords
Saw a video about it recently.
It is a concatenative language, like Forth, which I had tried out some earlier, via GNU Forth, IIRC. But there is more to Factor than just that.
Forth is fun.
Two books about it, by Brodie, are available to download. I have one of them as a hard cover book in a nice dark brown finish.