Docker Hub https://hub.docker.com/

GitLab Container Registry https://docs.gitlab.com/ee/user/packages/container_registry/

GitHub Container Registry https://docs.github.com/en/free-pro-team@latest/packages/guides/about-github-container-registry

Harbor, CNCF Graduated project https://goharbor.io/

VMware Harbor Registry https://docs.pivotal.io/partners/vmware-harbor/index.html

DigitalOcean Container Registry https://www.digitalocean.com/products/container-registry/