There are 2 repositories under auto-renewal topic.
Freenom 域名自动续期。Freenom domain name renews automatically.
Renew your Freenom domain (.cf .ga .gq .ml .tk) automaticly with Cloudflare Workers. 通过Cloudflare Workers自动续期Freenom域名(.cf .ga .gq .ml .tk)。
X.509 Certificate OCSP staple renewer tool
A multi-arch Let's Encrypt Docker image using Lego CLI client with convenient environment variables and auto-renewal support.
Google apps script for library loans notifications and auto renewal of loans
Certbot for Docker to obtain and automatically renew multiple certificates in one container.