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Dune, OCaml's build system, is quite mature and uses many techniques to implement a concurrent job scheduler and RPC server
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Nutrient
Nutrient – The #1 PDF SDK Library, trusted by 10K+ developers. Other PDF SDKs promise a lot - then break. Laggy scrolling, poor mobile UX, tons of bugs, and lack of support cost you endless frustrations. Nutrient’s SDK handles billion-page workloads - so you don’t have to debug PDFs. Used by ~1 billion end users in more than 150 different countries.
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Here's a compiler for a C-like language written in OCaml (note: I am not one of the authors though I did take the class). Despite it being a college project I think it shows very clean design and particularly good use of preprocessors. All of the details for the language and stuff is linked at the bottom. It's a relatively small codebase of course but I think this is good educationally.
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https://gitlab.com/tezos/tezos they have a good on onboarding doc too