Huh, I was not even aware OpenBSD had an LDAP server in the base system. ... Apparently, the Internet tells me just now, they have had it for a while now. Who would have known?
This makes me think of a comment I read around the time of the 5.8 release to the effect that with any other project this would reek of not-invented-here syndrome, except that the OpenBSD people have such a superb track record for getting things right. ;-)
I've seen extensions/plugins for the other guys, but not built-in
Also, nice to see pledge in the smtp server and mutt, and ChaCha20 in IPSEC