@augustus i have some potential answers / solutions
heavily in development, i cannot stress this enough.
apocalypse-proof collaboration network prototypes:
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https://walkaway.wiki-
https://xj9.io/wiki/#tomo-
https://portal.mozz.us/gemini/sunshinegardens.org/%7Exj9/wiki/-
https://git.sunshinegardens.org/~xj9/bbnet/i have some hardware concepts in progress
https://xj9.io/wiki/#tomomy research is around simplifying the protocol stacks so they can easily be ported to all kinds of hardware. you can think of tracker as the network counterpart to projects like collapseos. pretty much all of it is meant to run on salvage hardware like a wii, old computers, and microcontrollers.
there are a number of community operated mesh networks out there that can be deployed with extremely limited hardware. lots of research is going into mobile adhoc networks. the chaotic network topology wreaks havoc on IP, but there are some interesting non-IP approaches out there.
i could see mesh networks replacing internet for digital coms in this scenario. wouldn't be too hard to deploy with salvage hardware honestly.