* [Lego v4.32.0](https://github.com/go-acme/lego) – Let's Encrypt client and ACME library written in Go.

* [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.

* [CertMagic v0.25.2](https://github.com/caddyserver/certmagic) – Powerful library for automated TLS certificate management in Go applications.

* [Terraform ACME Provider v2.45.0](https://github.com/vancluever/terraform-provider-acme) – Provider for managing ACME certificate issuance and lifecycle via Terraform.

* [Pebble v2.10.0](https://github.com/letsencrypt/pebble) – Miniature Boulder-based RFC 8555 ACME test server intended for testing, not production.

* [Boulder v0.20260317.0](https://github.com/letsencrypt/boulder) – ACME-based certificate authority implementation written in Go.

* [LabCA v26.03](https://github.com/hakwerk/labca) – Private certificate authority for internal lab use based on an ACME-compatible implementation.

* [ACMEz v3.1.6](https://github.com/mholt/acmez) – Fully RFC 8555-compliant ACME client library in Go with robust retries, flexible solvers, and enterprise-grade API.