OpenProj
Free, open source project management software.
A free, open source desktop alternative to products like Microsoft Project, OpenProj has been downloaded over 1,250,000 times in over 142 countries and has quickly become one of the most popular open source applications for project management. OpenProj supports opening Microsoft or Primavera files, and shares its scheduling engine with Project-ON-Demand. It also has Gantt Charts, Network Diagrams (PERT Charts), WBS and RBS charts, Earned Value costing, and more. OpenProj is now included with Star Office in Europe, is available for Linux, Unix, Mac, or Windows, and is completely free.
