FORTH

Hi there /frog/. I'm interested in learning Forth, and would like to know what implementation you suggest.

I would use gforth. The only reason for this is that my package manager includes it.

My advice: find the one that has the best I/O support. (This is my general advice for selecting a language implementation.) I don't think you'll find I/O lacking in (just about) any forth, so it probably doesn't matter.