I was looking since long for a replacement of MS Project.
I was regularly monitoring SourceForge, and I also actively participated in the development of other software (GanttProject).
It was pure luck I stepped into OWB, which I now appreciate much.
I therefore tried to understand how come I never found it before, and I came to a few conclusions:
1) The description is missing the keywork GANTT
2) The ranking is relatively high
While the description is easy to patch, the rank improvement would require a more active development effort: after all, one release a year is not exciting for this excellent product.
Thank you, for the complement and the suggestions.