Calendaring and Contacts Management

This is a list of Free Software network services and web applications which can be hosted locally. Selfhosting is the process of locally hosting and managing applications instead of renting from SaaS providers. ---from github/Kickball/awesome-selfhosted

CalDAV or CardDAV servers

• Baïkal - Lightweight CalDAV and CardDAV server based on sabre/dav. (Source Code) GPL-3.0 PHP
• CalendarServer - Apple, Inc.'s standards-compliant server implementing the CalDAV and CardDAV protocols shipped with macOS Server. (Source Code) Apache-2.0 Python
• calypso - Python-based CalDAV and CardDAV server, forked from Radicale. (Source Code) GPL-3.0 Python
• DAViCal - Server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store. (Source Code) GPL-2.0PHP
• EteSync Server - End-to-end encrypted and journaled personal information server supporting calendar and contact data, offering its own clients. (Source Code) AGPL-3.0 Python/Django
• Radicale - Simple calendar and contact server with extremely low administrative overhead. (Source Code) GPL-3.0Python
• SabreDAV - Open source CardDAV, CalDAV, and WebDAV framework and server. (Source Code) MIT PHP
• Xandikos - Open source CardDAV, CalDAV and WebDAV server with minimal administrative overhead, backed by a Git repository. (Source Code) GPL-3.0 Python

CalDAV or CardDAV clients.

• AgenDAV - Multilanguage CalDAV web client with a rich AJAX interface and shared calendars support. (Source Code) GPL-3.0 PHP
• DAVDroid - Open-source CalDAV/CardDAV suite and sync app for Android. (Source Code) GPL-3.0 Java
• InfCloud - Open source CalDAV/CardDAV web client implementation. (Demo, Source Code) AGPL-3.0 Javascript
• EteSync Web - EteSync's official Web-based client (i.e., their Web app). (Demo, Source Code) AGPL-3.0 TypeScript