[Steltek]

Jane Street, financial trading company, uses OCaml a ton and publishes a lot of their libraries.

I played with it some back when I was dabbling in every language I could get my hands on. About when Scala was new (and constantly breaking between releases) and before Rust, Go, JS v8 were around. I really liked the functional aspect, which wasn't bolted on after the fact, and that it could be compiled to a real binary, not interpreted bytecode. In my naive youth, I viewed AOT compilation as the path to a true high level language that was also fast.

While it was neat, I moved on to Lisps/Schemes and now modern JS is my very happy compromise of functional and practical.