* [Lego v4.33.0](https://github.com/go-acme/lego) – Let's Encrypt client and ACME library written in Go.

* [cert-manager v1.20.0](https://github.com/cert-manager/cert-manager) – Tool for managing and automating TLS certificates in Kubernetes clusters.

* [eggsampler/acme v3.8.0](https://github.com/eggsampler/acme) – Go client library implementing RFC8555 (ACME v2) for interacting with ACME certificate authorities.

* [Acmesmith v2.9.0](https://github.com/sorah/acmesmith) – ACME v2 client designed for multi-server environments with cloud-based certificate and key management.

* [autotls v1.2.3](https://github.com/gin-gonic/autotls) – Automatic Let's Encrypt certificate management with HTTPS and HTTP-to-HTTPS redirection for Go servers.