Open Source Alternatives to Baïkal

A CalDAV and CardDAV server that provides a web interface for managing users, address books, and calendars. The software allows users to host their own contacts and calendars to maintain privacy and sync data across various devices, including iOS, Mac OS X, Android via DAVx 5, and Mozilla Thunderbird. It is designed for individuals or organizations that want to maintain control over their personal data by hosting it on their own infrastructure. The software is deployed on a PHP capable server and supports data storage in either MySQL or SQLite databases. It is compatible with any application capable of using CalDAV and CardDAV protocols. The product is free and open-source, released under the GNU GPL v3 license.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to Baïkal give you an option you fully own. You can self-host them, so your data stays on infrastructure you control. This page lists 1 open source alternative to Baïkal. The most popular is Davis. It uses the MIT license and ships an official Docker image.