Radicle

Radicale is a lightweight calendar and contact server designed for individuals and small organizations looking to manage their scheduling and contact needs efficiently. It supports the widely used CalDAV and CardDAV protocols, enabling seamless integration with popular calendar and contact management applications. With a focus on simplicity, Radicale allows for easy setup and administration without complex configurations.

Key Features:

• Shares calendars and contact lists through CalDAV, CardDAV and HTTP.
• Supports events, todos, journal entries and business cards.
• Works out-of-the-box, no complicated setup or configuration required.
• Can limit access by authentication.
• Can secure connections with TLS.
• Works with many CalDAV and CardDAV clients.
• Stores all data on the file system in a simple folder structure.
• Can be extended with plugins.