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ObjectPlacementTBH by Adanteh
Uses Python scripting on the backend to handle much of the stuff like exporting objects etc.
Has excellent compositions / prefab, general brush and fence/wall tools.
Use install_requirements.bat in the root directly before launching from ArmA 3.
Gitlab objectplacement-tbh for issue tracking etc. Discord ObjectPlacementTBH.
More info and download from ObjectPlacementTBH steam workshop.