app-crypt/
certbot-dns-dnsimple

DNSimple Authenticator plugin for Certbot (Let's Encrypt Client)

https://github.com/certbot/certbot

There are no pull requests

You think something is missing here?
Start with filling a new pull requests.

If you also like to help the Gentoo project, you can consider sending a Pull Request via GitHub.
Before doing so, you might want to take a look at the wiki page.