If you want a professional-level editor for open-world games:
The game Hatred also uses Chrome Engine 5 and includes modding tools on Steam, though the version is older than the World War 3 one. Chrome Engine 5 Level Editor Download
It was a significant leap from previous versions, offering enhanced lighting, physics, and sprawling open-world capabilities. How to Get the Level Editor (ChromEd) Unlike modern engines like Unreal Engine , Techland’s Chrome Engine is proprietary If you want a professional-level editor for open-world