Planing an event or even a Conference: Pentabarf will do the job for free!!
From What The Wiki?!
Sven Klemm and Tim Pitlov presented Pentabarf conference planing system which evolved from the need to manage the XXC3 congresses without fiddling with wiki or some other content management system not themed at organizing conferences beeing at least as huge as XXC3. They proved using 21C3 as an example that Pentabarf allthough the TODO list is still long can handle such events.
