CardDAV/CalDAV is a standard-protocol based on WebDAV to sync address books and calendars. It’s also used by Apple and Google. This protocol works out of the box on all Apple devices. For Android there is a free app available.
On Apple devices you can simply use our over-the-air configuration. During installation only usernames and passwords need to be entered. Just install the resulting profile and you will be able to use email, contacts and calendar on your OSX/iOS device.
On any other compatible client use cloud.snapdragon.cc and your usual username. The ownCloud-webinterface is available on the same address. There you can access your contacts and appointments through any browser.