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Not OPA-based , but Kyverno-based. Kyverno is also CNCF, basically an overlap of OPA functionality (with some give and take.)

Nirmata provides commercial/enterprise options around Kyverno.

Permit.io

they don't actually "support" OPA. more like they run/depend on OPA

Gabriel from Permit.io here

Actually, Permit does support OPA. In fact, about 15% of our large customers came from StyraDAS and use Permit as their enterprise OPA solution.

On top of that, we offer OPAL+, which is already adopted by Fortune 100 companies as a production-grade OPA framework.