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utop for ocaml is cool, gives type signatures for functions. no explicit help, but does offer completions with tab.

Similarly, rtop for reason.

https://opam.ocaml.org/blog/about-utop/ and https://opam.ocaml.org/packages/rtop/

I wrote a small thing for adding a `#doc List.find` directive. However, I don't maintain it anymore since I think it doesn't see much use and it's work to keep up on OCaml compiler internals changes (and it's my impression it never picked up much adoption). https://github.com/reynir/ocp-index-top

dbuenzli's down also has a similar feature.

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