TerraBrush is a free and open source C# based Terrain system for the Godot game engine. This add-on adds more than just height mapped terrain though, as it also has dynamic map creation, foliage and object placement, river creation and more. Being written as a C# extension, it requires the C#/Mono version of the Godot game engine to work.

Links
https://gamefromscratch.com/terrabrus...
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An alterative terrain option for the Godot game engine is Terrain3D:
https://gamefromscratch.com/terrain3d...