If you have some good PowerShell examples, feel free to contribute them, I’m sure they’d be welcome

If you are bored of writing Brainfuck in your spare time, try Lambda Calculus instead as an exciting alternative!

Some of the examples seem to be more “unintuitive for newbies”, but there are still some good ones in there

Factor, Prolog, and Python has the fractions module

Haskell: deriving Eq