看到 OpenBSD 直接把 ACME 協定的 client 放進系統內，而 ACME 也就是 Let's Encrypt 所使用的協定：「Let's Encrypt client imported into -current」：
CVSROOT: /cvs Module name: src Changes by: florian@cvs.openbsd.org 2016/08/31 16:01:42 Added files: usr.sbin/acme-client: ChangeLog Makefile acctproc.c base64.c certproc.c chngproc.c dbg.c dnsproc.c extern.h fileproc.c http.c http.h jsmn.c jsmn.h json.c keyproc.c letskencrypt.1 main.c netproc.c revokeproc.c rsa.c rsa.h sandbox-pledge.c util-pledge.c util.c Log message: Import Kristaps' letskencrypt and call it acme-client in tree. OK to get it in deraadt@ (and probably beck@) At least deraadt@, beck@ and otto@ are fine with the name and the disagreements stopped.
用的是 acme-client，先前叫做 letskencrypt，以 C 開發的 ACME client。