CRI-O - CRI-O is an implementation of the Kubernetes CRI (Container Runtime Interface) to enable using OCI (Open Container Initiative) compatible run-times.
Buildah - A tool that facilitates building OCI images
Skopeo - Work with remote images registries - retrieving information, images, signing content
Docker - Enterprise Container Platform. Build, Share, and Run Any App, Anywhere.
Docker Swarm - (on top of docker)(can use Kubernetes under the hood) -
Containerize Squadsnap