Chandler

The Open Source Applications Foundation are developing Cosmo, which is a CalDAV server written in Java and Chandler, which is a CalDAV capable mail and calendaring application written in Python.

Basic setup is as follows:

1. Select "Subscribe" from the "Share" menu (or in older builds it was in the "Collection" menu).
2. Enter a URL like: "http://calendar.example.net/caldav.php/username/home/" (click "Subscribe")
    
3. You will then be prompted for a username/password with in an expanded dialog. Enter these and click "Subscribe" again.
    
4. You should now have a new calendar showing.

Caveats

At version 0.7alpha3 the calendar is subscribed and displayed, but the 'displayname' property which the server sends is not used and the calendar is displayed with a blank name. Double-click on your new calendar and enter a name in the space available.

Chandler describes itself as 'an experimentally usable calendar', and it certainly feels that way. It also will only synchronise to the CalDAV server either when you press the "Sync" button or with a default frequency of hourly. This is quite different to the other clients I have used which all aggressively push new and changed items to the server as soon as possible, but which may be lazy about fetching updates.

Operation with DAViCal is not yet perfect but basic operation is satisfactory. I will be concentrating on making DAViCal interoperate with Chandler over coming releases.