Hello!
I used security/acme-client
Too bad it was removed.
And .. security/acme.sh no exception for remove.
The site https://kristaps.bsd.lv/acme-client/ is available, source code version 0.1.16. can be built and used without a ports tree.
I try it
That page tells you to use the code from OpenBSD base, now it's just a matter of someone modifying the port to get the source from OpenBSD (not sure how that can be done, or should we get it in base as well?).