carddav

Radicale is a simple calendar and contact server with extremely low administrative overhead. Built with Python, it provides a lightweight, easy-to-deploy CalDAV and CardDAV server that focuses on simplicity and minimal configuration requirements.

Baïkal is a lightweight CalDAV and CardDAV server based on sabre/dav. Built with PHP, it provides a simple, efficient solution for calendar and contact synchronization across devices with minimal setup and administrative overhead.

SabreDAV is an open source CardDAV, CalDAV, and WebDAV framework and server. Built with PHP, it provides a comprehensive, standards-compliant foundation for building calendar, contact, and file synchronization solutions with extensive protocol support.

Davis is a simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal. Built with PHP, it provides a modern, user-friendly interface for managing CalDAV and CardDAV servers.

Xandikos is an open source CardDAV and CalDAV server with minimal administrative overhead, backed by a Git repository. Built with Python, it provides a unique approach to calendar and contact synchronization using Git for version control and data storage.