Self-Hosted Software Calendar & Contacts - CalDAV or CardDAV Servers

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1. Baïkal

Lightweight CalDAV and CardDAV server based on sabre/dav. ([Source Code](https://github.com/sabre-io/Baikal)) `GPL-3.0` `PHP`

2. calypso

Python-based CalDAV and CardDAV server, forked from Radicale. ([Source Code](https://keithp.com/git/calypso.git)) `GPL-3.0` `Python`

3. DAViCal

Server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store. ([Source Code](https://gitlab.com/davical-project/davical)) `GPL-2.0` `PHP`

4. Davis

A simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal. `MIT` `PHP`

5. DecSync CC

Serverless contacts, calendar synchronization using your own file syncing method i.e Syncthing, Nextcloud etc. ([Source Code](https://github.com/39aldo39/DecSyncCC)) `GPL-3.0` `Kotlin`

6. Etebase (EteSync)

End-to-end encrypted and journaled personal information server supporting calendar and contact data, offering its own clients. ([Source Code](https://github.com/etesync/server)) `AGPL-3.0` `Python/Django`

7. Radicale

Simple calendar and contact server with extremely low administrative overhead. ([Source Code](https://github.com/Kozea/Radicale)) `GPL-3.0` `Python`

8. SabreDAV

Open source CardDAV, CalDAV, and WebDAV framework and server. ([Source Code](https://github.com/sabre-io/dav)) `MIT` `PHP`

9. Xandikos

Open source CardDAV and CalDAV server with minimal administrative overhead, backed by a Git repository. ([Source Code](https://github.com/jelmer/xandikos)) `GPL-3.0` `Python`