Bocker: Docker implemented in around 100 lines of Bash (2015)

The fact how simple it is to re-implement a large part of Docker because all it fundamentally is a bit of glue code to the kernel is the biggest problem Docker-the-company faced and still faces.

Where Docker adds real value is not (just) Docker Hub but Docker for Windows and Mac. The integrations offer a vastly superior experience than messing around with VirtualBox and Vagrant by hand (been there, done that) to achieve running Docker on one's development machine.

Rancher desktop is also a viable option and free. Many including my work moved to it after Docker's new licensing kicked in.

IMO the real magic of Docker was the Docker/OCI image format. It's a brilliant way to perform caching and distribute container images, and it's really what still differentiates the workflow from "full" VM's.

My main dev machine is Linux so I use Rancher Desktop but I also have a MacBook Pro m1 machine. Orbstack is so much better than rancher and docker desktop. I know they are a small company but hell if their product isn’t significantly more efficient and better.

Podman-Desktop is also great b/c it now has gpu support on macOS (for the Linux container)