dCaldav

Many thanks to the people who have contributed public domain / GPL code towards this project. In no specific order:

The iCalendar Code

This PHP iCalendar Parser class was developed by Seven Goslings which is a nom de plume for Morten Fangel. Unfortunately, it doesn't look like Morten is too keen on the continued support / development of this library which may impact the development of dCaldav. In particular, it would be good if the library had a Free/Busy facility. Looks like I may have to develop that myself. 

Seven Goslings can be found here

The repository for the iCalendar Parser can be found here

The Screen Scraping Code

The PHP code which interfaces between the client (dCaldav) and the server has been modifed from a http class developed by Troy Wolf. That in itself looks remarkably similar to the Drupal HTTP module. I am not in a position to say which came first.

Troy's work can be found here