CalDavZAP is a CalDAV Web client with a powerful event/todo editor. It is compatible with Safari, Webkit, Firefox, Opera (15+), iCab, and Chrome, and supports all major CalDAV servers.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release contains major bugfixes, improvements, and new localizations. It also adds lot of new features such as support for delegated and subscribed calendars.