CalDAV [Wikipedia] is an Internet standard for client access to scheduling information on a remote server. CalDAV is typically used for synchronizing calendars with services such as Google Calendar and Apple's iCloud Calendar, however the CalDAV protocol also includes a specification for to-do list entries.
CalDAV support is under active development and additional synchronization capabilities will be added. Currently the following data is synchronized through CalDAV:
- Due date and time
- Create and delete CalDAV collections
- Move tasks between CalDAV lists