Yep, but the rest can mostly be replaced with a mailing list. Or, if you’re allergic to email, there’s also https://forgejo.org/.

Federated browsers

That’s literally just regular browsers, you can interact with any one of billions of webservers

Federated github

Git is federated by nature, you can add as many remotes as you wish and push/pull to all of them. Add in a mailing list for issue tracking and “pull requests” (patch submissions) and you’re golden. You can look up sourcehut to self-host a well-integrated combination of the two.

Federated hosting providers

Not sure what exactly you mean by this but maybe take a look at IPFS, although it’s more P2P then federation.

Federated internet

Internet is already fairly federated by nature - most commonly used protocols in the OSI stack are open and you can host your own components of critical infrastructure. Getting others to interact with them might be difficult due to security & privacy issues.

TLDR: closest ever to human extinction by one second compared to 2023 (when it was 90). Most current threats already existed back then (with the exception of AI) and have seen only mild increases.

Honestly, I think I’m mostly set already (as I often go backpacking and there’s no internet there). I have offline maps for the country I’m in and neighboring regions downloaded in OsmAnd and mapy.cz (two sources just in case), Wikipedia in Kiwix, and my custom NixOS setup as a bootable ISO on a flashdrive. I’ll probably miss being able to watch science/maths edutainment on YouTube, but it’s not something I’d download.

If the Internet went away, we’d have a little time before batteries were not viable even if replaceable, as distributing those batteries would get problematic.

Good thing portable solar panels & lead-acid batteries exist that can easily power a couple of laptops even if their internal batteries are cooked. Solar panels last for a very long time if cared for, and lead-acid batteries can be (somewhat) useful almost indefinitely if you replace the electrolyte.

No, we’re all gonna need to learn how to fight, and live without hospitals and drugs and probably electricity.

So it would be really handy to have instructions for maintaining or even building weaponry, medical/medicinal literature to find useful herbs or other remedies, and engineering literature/textbooks/software to help us rebuild the electrical grid and then the Internet.

Honestly, while fun, those videos don’t provide too much value per GB - and I say that as someone who’s watched almost all of them. Their main actual benefit besides entertainment is (IMHO) getting people interested in the relevant field so they study more thoroughly. They often explain simple yet dazzling concepts which get you hooked but don’t provide much value on their own, and don’t directly enable you to solve real-life problems. Even more involved videos like those by 3blue1brown are still edutainment at their core, as acknowledged by the author. In an apocalypse (which, let’s face it, is the most likely reason the internet would indefinitely go down in a developed country) you would be much better off with engineering (mechanical, electrical, etc) literature and textbooks, maybe a couple science textbooks for good measure (I have a drawer full of the Feynman lectures in case something like this happens).

Very few things are trully impossible in linux land, but having multiple package managers on a single system is just asking for trouble.

Nix/Guix (and a couple other similar package managers) are specifically designed to not interfere with the rest of your system.