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by momentoftop 22 days ago
Isabelle is still a very active LCF proof assistant, and it's still written in Poly/ML. It's pretty aggressively concurrent under the bonnet, and leverages Poly/ML well for that. There's still HOL4, which predates Isabelle and is still going, and it also recommends using Poly/ML.

I mostly worked with HOL Light which started as a CAML project and now runs on OCaml.