There are various weird and wonderful niche languages out there, if you appreciate programming languages as an end in themselves. Two examples: Sentient [0] and Factor [1][2].
> The MiniSat solver is Sentient’s default. It is a version of MiniSat that has been compiled to JavaScript with Emscripten. This means that it can run in a web browser and it does not have any dependencies when run from the command-line.
[0] https://sentient-lang.org/
[1] https://factorcode.org/
[2] Factor's home-page does a poor job of presenting examples to give a flavour for the language, so here's one on GitHub: https://github.com/factor/factor/blob/master/basis/roman/rom...