CJDNS (better when using with ZeroNet, for a true decentralized Internet) enables people to be their own ISP (Internet Service Provider)
https://github.com/cjdelisle/cjdns
(ZeroNet mirror not available yet)

Currently there is Yggdrasil, that is a more scalable alternative to CJDNS

CJDNS is already built-in with Floflis OS