Certify The Web (a.k.a Certify) is the most popular GUI for professional ACME certificate management on Windows, allowing you to easily request, deploy, auto-renew and manage free SSL/TLS certificates from Certificate Authorities such as Let's Encrypt, BuyPass Go SSL, ZeroSSL and custom CAs.
You can read a summary of high-level features the software offers here: https://certifytheweb.com/home/features
This guide will help you get started and detail some of the more advanced options available in the software. Documentation applies to the latest version of the software. You are encouraged to always keep the software up to date as some updates are essential.