Ask HN: How do you repeatedly setup new dev laptops?

MacOS, Linux and Windows solutions all welcome. I really dislike the process of setting up a new laptop, and remembering all the software I typically install. Not everything has a Homebrew package, although that handles many things.

Especially across multiple operating systems, how do you make this a quick and reliable process without resorting to pre-built images that get out of date quickly? I've used JAMF some professionally for this, but its MacOS only and I'd prefer FOSS when possible.