Gantt project charting for Linux

http://ganttproject.biz/

GanttProject is a free and easy to use Gantt chart based project scheduling
and management tool. Our major features include:
Task hierarchy and dependencies
Gantt chart
Resource load chart
Generation of PERT chart
PDF and HTML reports
MS Project import/export
WebDAV based groupwork

(See attached file: ganttproject-house-building-sample.png)