cert-manager, the Certificate Manager
Like the name indicates, cert-manager adds certificates and certificate issuers as custom resources for Kubernetes.
It's possible to manage self-signed certificates, a private CA, ACME issuers, ...
cert-manager also automatically generates and renews certificates using the Kubernetes annotation field in the Ingress resource.
Although cert-manager is not compatible with the Traefik IngressRoute resource, the certificate can be managed using a Certificate resource.