Baïkal source
Lightweight CalDAV and CardDAV server based on sabre/dav.
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Self-hosted Calendar & Contacts software (2026)
[CalDAV](https://en.wikipedia.org/wiki/CalDAV) and [CardDAV](https://en.wikipedia.org/wiki/CardDAV) protocol servers and web clients/interfaces for [Electronic calendar](https://en.wikipedia.org/wiki/Calendaring_software), [address book](https://en.wikipedia.org/wiki/Address_book) and [contact management](https://en.wikipedia.org/wiki/Contact_manager).
Related: Groupware
8 open-source apps · all free & self-hostable
DAViCal source
Server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store.
Davis
A simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal.
Keeper.sh source
Calendar syncing tool that pulls and pushes events between calendar sources and destinations via iCal/ICS or OAuth, with support for anonymized busy/free events.
Manage My Damn Life source
Manage my Damn Life (MMDL) is a self-hosted front end for managing your CalDAV tasks and calendars.
Radicale source
Simple calendar and contact server with extremely low administrative overhead.
SabreDAV source
Open source CardDAV, CalDAV, and WebDAV framework and server.
Xandikos
Open source CardDAV and CalDAV server with minimal administrative overhead, backed by a Git repository.