GanttProject is a free and easy to use Gantt chart based project scheduling and management tool.

Features:

• Task hierarchy and dependencies
• Gantt chart
• Resource load chart
• Generation of PERT chart
• PDF and HTML reports
• MS Project import/export
• WebDAV based groupwork

Note: While the software is classified as free, it is actually donationware. Please consider making a donation to help support development.