GanttProject is a cross-platform desktop tool for project scheduling and management. It runs on Windows, Linux and MacOSX, it is free and its code is opensource. What can it do?

• Gantt chart.
  Create work breakdown structure, draw dependencies, define milestones.
• Resources.
  Assign human resources to work on tasks, see their allocation on the Resource Load chart.
• PERT chart.
  Generate PERT chart from Gantt chart.
• Export.
  Save charts as PNG images, generate PDF and HTML reports.
• Interoperate.
  Import projects from and export them to Microsoft Project formats. Export to spreadsheets with CSV.
• Collaborate.
  Share projects with your colleagues using WebDAV.