Https://libremesh.org/ is interesting, but it only really works if the devices is close enough to each other and either way, you will need a gateway to the rest of the internet. Source: over 2 years ago

Few routers are supported and widespread ad-hoc mesh networking remains mostly a pipe dream at this point. You can find a few attempts to do what you're asking for such as commotion and libremesh but they are just attempts and require significant planning put into the layout and configuration of the network which largely defeats your reason for wanting mesh networking. Like I said, there is little router support... Source: over 2 years ago

Today I head about mesh networks (https://libremesh.org/ or https://librerouter.org/) in a comment on r/ipfs. Source: over 3 years ago

IPFS is a solution on the software side for hardware check out https://libremesh.org/ or https://librerouter.org/. Source: over 3 years ago

Maybe https://radicale.org/ could fit the bill, CalDav for as a calendar server and CardDav for contacts. - Source: Hacker News / 11 months ago

I now use CalDAV Synchronizer to sync Outlook to my Radicale CalDAV / CardDAV "server" (a Raspberry Pi), with DAVx running on our phones. Source: about 1 year ago

Setup: 1. Install a CalDev server on my home server (running Debian Linux) using maybe Radicale (https://radicale.org/) 2. Use the Linux version of ProtonMail Bridge on this server to set up IMAP to connect to this CalDev server 3. Configure filters to automatically forward event invites sent to my ProtonMail address to my CalDev server, decrypted by Bridge 4. Configure my CalDev server to use ProtonMail to send... Source: over 1 year ago

Caldav is what you are looking for. The other comments mention implementations of them and I can vouch for radicale pretty barebones but does its job. Source: over 1 year ago

We are thinking of writing a guide to setting up a small Radicale instance. This could be hosted on a raspberry pi, or small NAS or something. Source: over 1 year ago