overlay networking since each node is both a server and a client
overlay networking to create a direct encrypted tunnel between two nodes even if they’re both behind firewalls. Each node doesn’t even need to know the other’s IP address before starting the connection.
Hyprspace
n2n
nebula
qaul

P2P
geneva Protocol
Hypercore Protocol and pinecone and libp2p and devp2p
gemini
Earthstar
Pigeon

idea

We know that no country blocks imap pop smtp, bridges can be built over it, or encrypted traffic can be obfuscated as imap pop smtp.

ping test smtp.google.com smtp.gmail.com