TaskJuggler - a project planner software
TaskJuggler is an extremely powerful open-source project management software. Unlike other tools of this sort it is almost completely text-file driven and batch mode (yes, it has a nice GUI as well, but the operation is editing of the text project file). Also, the reports it generates are completely scriptable (actually there’s no other way of doing them). This is different from you’d expect, but maybe for us geeks it’s better to have something that works this way? 
It is really powerful and looks actually usable (unlike some other open-source projects like planner, which aspire to be but are IMO not even close).
Additional advantages I see are: - easy to track changes if you keep the project file in CVS/SVN - can easily script it, so that you can see your project status on the website?
Maybe I will use one day?