containerd (which #Docker is built on top of) is actually FOSS and very usable with Nerdctl (though the packaging is kinda lacking last I checked)

As others have said, podman is an option, that is if you are ok with Redhat’s brand of “Open Source”.

You could just manage it yourself and use system packages if you hate your life and have too much free time.

P.S. @[email protected] Hopefully this comment properly finds you, as it looks like some sort of Mastodon-sourced sort of thing, and I have not interacted with one of those from Lemmy before. It should just work I think, but who knows.