Radicale
Simple calendar and contact server with extremely low administrative overhead.
It provides a CalDAV and CardDAV service that lets users share calendars, to‑do lists, journal entries, and contact books over HTTP. The server stores all information in a straightforward file‑system hierarchy, allowing easy backup and direct inspection of data. Authentication can be configured to restrict access, and TLS support secures connections for remote clients.
The software is designed for self‑hosting with minimal administrative effort; it runs out of the box without complex configuration files or external dependencies. A plugin system permits optional extensions, while compatibility with a wide range of CalDAV and CardDAV client applications ensures it can be integrated into existing workflows.
Released under the GPL‑3.0 license, the project is free, open‑source, and maintained as a stable, production‑ready solution. Documentation, issue tracking, and community discussions are available through its public repository and website.
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