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Radicale is a self-hosted CalDAV and CardDAV server implemented in Python that enables calendar and contact synchronization across multiple clients using open standards. It stores all data directly on the filesystem in a simple folder hierarchy, eliminating the need for an external database, and automatically tracks every change by committing modifications to a Git repository for version history and backup. The server distinguishes itself through a modular plugin architecture that allows custom Python modules to extend authentication, storage backends, and web interface functionality at start
sabre/dav is a CalDAV, CardDAV and WebDAV framework for PHP
The Etebase server (so you can run your own)
The main features of etesync/server are: Calendar and Contact Servers, Media and Communication, Calendar And Contacts.
Open-source alternatives to etesync/server include: sabre-io/dav — sabre/dav is a CalDAV, CardDAV and WebDAV framework for PHP. tchapi/davis — 🗓 A modern, simple, feature-packed, fully translatable admin interface for sabre/dav based on Symfony 7 and Bootstrap. jelmer/xandikos — A CalDAV/CardDAV server backed by Git. kozea/radicale — Radicale is a self-hosted CalDAV and CardDAV server implemented in Python that enables calendar and contact… sabre-io/baikal — Baïkal is a Calendar+Contacts server. stalwartlabs/stalwart — Stalwart is a self-hosted email and collaboration infrastructure that provides an integrated mail server supporting…