GanttProject is a project scheduling application written in Java and featuring Gantt chart, resource management, calendaring, import/export (MS Project, HTML, PDF, spreadsheets). Learn more on http://ganttproject.biz
Midnight Xen is a project to finish the Xen project manager for zope. We also intend to implement Gantt and PertChart features. The first priority is to make a build that works right on improt into Zope and then re-initiate the security later.