http://www.freshports.org/net/openntpd/
It is currently marked as ignore, so packages are not built because it requires LibreSSL by default which means it will cause conflicts with stuff that uses OpenSSL.
On July 4th, this commit was added:
https://docs.freebsd.org/cgi/getmsg.cgi?fetch=395088+0+/usr/...
However I don't think this got merged to the quarterly branch until later, I rebuilt openntpd with OpenSSL on July 5th of this year.