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Paul Biggar of Darklang started a stdlibrary called tablecloth which offers the same API on frontend (Bucklescript/Reason) and backend (OCaml).

Yet he too gave up on ocaml

Yet another standard library for OCaml? You sure it wasn't a parody? :)

I can think of: TheActualStdlib, Base/Core_kernel/Core, Batteries, Containers, Belt, ...