ProjectLibre
About
ProjectLibre is the #1 alternative to Microsoft Project. 5,500,000 downloads in over 192 countries and translated into 29 languages. ProjectLibre manages projects on all 7 continents including projects on Antarctica!
ProjectLibre is the only open source solution with a compatible data model with Microsoft Project so you can import even the most detailed project data.
ProjectLibre has Gantt Chart, Network Diagram, WBS, RBS, Task Usage, Resource Usage and more