First, you will need an account and download the client, follow the instructions according to your operating system https://keybase.io/download. - Source: dev.to / over 1 year ago

Finally, while you don't actually need to have a remote repo, I recommend using Keybase for git hosting if you decide to set one up, it's free and has much more lax rules about filesize than GitHub does these days (did you know that GitHub now meters downloads from GitLFS? Downloads, not uploads... it's bad.). Source: about 2 years ago

Download Keybase here and install. https://keybase.io/download 2. Make a free account, place only your new username and skip the rest like email and phone number SKIP THAT ALL RIGHT UPPER CORNER ( SKIP ) on keybase after install. 3. Go to left column in keybase that say TEAMS. 4. There are two buttons Click JOIN TEAM. 5. Typ there ( cnc_files4all ) and join it. 6. After that you provided to the team go to TEAM... Source: over 2 years ago

Use https://bridgefy.me for offline communication. Source: over 1 year ago

Have a look at https://bridgefy.me/, this may be interesting to you. Source: over 1 year ago

5. There's another company called Bridgefy https://bridgefy.me/ that built a chat app used in some of the Hong Kong protests. - Source: Hacker News / almost 2 years ago

Bridgefy is designed to work on local Bluetooth (max about 100m) during natural disasters, a protest, at large events, at schools, etc. It will create a mesh network, so one or more other peers can help transmit messages further. See https://bridgefy.me/. Source: about 2 years ago

How about offline P2P mesh bluebottle chat? Check out this one used by protestors https://bridgefy.me/. Source: over 2 years ago