Docker 514 made containers popular, but the formats it popularized now belong to the Open Container Initiative (OCI Specifications), so any OCI tool can build, pull and run BookNest's images. This section runs the two most important alternatives, Podman 47,580 and Buildah 919,369 , for real, looks under Docker at containerd 234,762 , and compares the desktop products that package all of this for Windows and macOS.