Radicale

About Radicale

Radicale is a small but powerful CalDAV (calendars, todo-lists) and CardDAV (contacts) server, that:

• Shares calendars through CalDAV, WebDAV and HTTP.
• Shares contacts through CardDAV, WebDAV and HTTP.
• Supports events, todos, journal entries and business cards.
• Works out-of-the-box, no installation nor configuration required.
• Can warn users on concurrent editing.
• Can limit access by authentication.
• Can secure connections.
• Works with many CalDAV and CardDAV clients.
• Is GPLv3-licensed free software.

https://radicale.org/

参考： CalDAV Server