Une comparaison de dix clients pour Let's Encrypt. Je cite la liste :

• letsencrypt-auto, the official Let’s Encrypt client
• acme-tiny, a tiny semi-automatic Python implementation
• gethttpsforfree.com, a static website to assist the manual process
• simp_le, another Python implementation
• letsencrypt-nosudo, the predecessor of acme-tiny and gethttpsforfree
• acmetool, an ACME client in Go
• lego, an ACME client and library written in Go
• letsencrypt.sh, a Bash ACME client implemenation
• acme, ACME implementation in PHP
• lescript, a PHP library