Project information:
Name: ganttproject
Homepage: https://www.ganttproject.biz/
License: opensource GPL3
Upstream has been contacted:
i found it very interesting, i could create project management & gantt chart easily
it provides most must have features in project management : task management (with dependencies & relations), resources, progress monitoring, & baseline
it is a very good microsoft project alternative, but hasn’t been available at flatpak (yet)