-[DAViCal](https://www.davical.org/) - 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`
-[Davis](https://github.com/tchapi/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`
-[DecSync CC](https://f-droid.org/packages/org.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`
-[EteSync Server](https://www.etesync.com) - 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-skeleton)) `AGPL-3.0``Python/Django`
-[Etebase (EteSync)](https://www.etebase.com/) - 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`
-[Radicale](http://radicale.org/) - Simple calendar and contact server with extremely low administrative overhead. ([Source Code](https://github.com/Kozea/Radicale)) `GPL-3.0``Python`
-[SabreDAV](http://sabre.io/) - Open source CardDAV, CalDAV, and WebDAV framework and server. ([Source Code](https://github.com/sabre-io/dav)) `MIT``PHP`
-[Xandikos](https://www.xandikos.org/) - 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`
