Radicale
Radicale is a CalDAV/CardDAV server. It lets you sync your calendars (CalDAV) and contacts (CardDAV) to apps on your phone, laptop, and desktop using any standard client.
Connecting a client
Section titled “Connecting a client”External clients can’t use the browser login, so they sign in with an app password instead of your account password.
You’ll need three things:
- Server URL —
your server URL. - Username —
your username. - App password — create one on the app’s Settings tab. It is shown only once.
Add a CalDAV (calendars) or CardDAV (contacts) account in your client of choice — iOS, macOS, Thunderbird, or Android via DAVx⁵ — using those three values. Your calendars and contacts then sync automatically.