Mesh networks maybe? I'm not sure what you're looking for.
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https://dn42.eu tries to create a huge overlay mesh VPN which helps you understand the underlying techniques for building a global WAN aka Internet.
In case of emergency one could certainly try to get DN42 running when central internet infrastructure is failing. Sadly, the peering points are mostly private ISPs and no big internet exchanges.
There's I2P.
i read through the introduction on wiki and don't understand how we could use it without an ISP. Eli5?
There are a few mesh network projects that, when done well, function as an alternative internet. I worked on one but dealing with hardware and firmware was way beyond my skill set.
I reached out to a few here: https://github.com/redecentralize/alternative-internet#networking
and i'm hoping there is something easy i can do to help out