WebDAV
You can use WebDAV for calendars, files, tasks and contacts.
Calendars/Tasks (CalDAV)
Contacts (CardDAV)
Files
Client Software
Name | OS | Description |
---|---|---|
DAVx5 (formerly DAVDroid) | Android | Synchronise Tasks, Calendars and Contacts |
Mozilla Thunderbid | Windows, macOS, Linux | Mail client with integrated Lightning extension for Calendar, needs plugins from Sogo.nu for CalDAV/CardDAV |