OpenProj ist ein kostenloser Ersatz für MS Project.
Es läuft plattformübergreifend dank Java.
Aus der Beschreibung:
"A desktop replacement for Microsoft Project
It is capable of sharing files with Microsoft Project and has very similar functionality (Gantt, PERT diagram, histogram, charts, reports, detailed usage), as well as tree views which aren't in MS Project. "
Homepage
http://openproj.org/openproj
