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Based on our record, Radicale seems to be more popular. It has been mentiond 15 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
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
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Baïkal - Cal and CardDAV server
Roundcube - Web-based IMAP email client
SOGo - SOGo is groupware server with a focus on scalability and open standards.
mailcow - An open source mailserver suite.
DAViCal - DAViCal is a server for calendar sharing.