Reminder: initiatives like Hyperboria (formerly Project Meshnet) exist. Using the cjdns protocol and some communications medium (e.g. wires, line-of-sight microwave, WLAN, IPoCP), you can become the ISP for your own local area, assigning IPv6 addresses and providing a bridge (or many) to the 'net at large.

The various pages on the topic aren't well linked (due to server migrations, name changes, low attention to marketing… you know how devs are), but the main homepage is https://hyperboria.net/, some installation guides can be found at https://projectmeshnet.org/docs/ (which mostly links to https://github.com/cjdelisle/cjdns#how-to-install-cjdns) and generic, somewhat complete documentation is https://docs.meshwith.me/.

cjdns has some other neat features, which are outlined in its whitepaper: https://docs.meshwith.me/Whitepaper.html