Looking for a task scheduler/project management system...

["David Fallon" <dfallon ucla edu>]

Has anyone built a task scheduler/project management system, or does anyone
know of one already out there? Preferrably, it's gnome-aware/gtk widget
driven, but anything linux based is potentially useful (for a feature set if
nothing else...). This is something I think gnome needs...

Something that allows you to manage a todo list, perhaps between multiple
people...