Let's Encrypt
Hiawatha comes with a script to acquire and maintain Let's Encrypt certificates. It's included in the Hiawatha source package (directory extra/letsencrypt), but you can also download it as a separate package via the links below.
Usage
Usage: ./letsencrypt <command>
Commands: register: Register your account key at the Let's Encrypt CA.
request <hostname> [<cert.pem>]: Request new certificate for website.
expire: show number of days left before certificate expires.
renew [restart]: Renew the almost expired Let's Encrypt certificates
in Hiawatha's certificate directory.
revoke <cert.pem>: Revoke the certificate.