SOGo is a great groupware, offering webmail, contacts and calender interfaces both in the web interface as well as CalDAV and CardDAV access.
However, configuring your iDevice or Mac OS X to use them is a tedious task and not always intuitive. The following creates a configuration file for your mail address for many modern setups.
Detailed instructions about the use of this autoconfigurator can be found in the accompanying blog post.