godot_heightmap_plugin
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Zylann
Fractal noise brush
Raise and Lower tools are quite primitive nowadays, and mostly used for blocking out a terrain or quickly adjust it. A new kind of brush is needed, which would add details to a roughly sculpted terrain. It should be based on fractal noise, so that will require a noise library such as OpenSimplex. Given how small such libraries are, it's possible to embed OpenSimplex within the GDNative C++ code...
Could first step be adding a semi-transparent and/or irregular brush, similar how for example unity does it?
This might be somewhat easier and will also give user total control of end result.
You can load a custom brush already, and even create your own as long as it's saved as EXR.
As of today GPU painting is supported, so it would be easy to implement a noise brush with a shader. I'd use something similar to what is described in this article: https://www.decarpentier.nl/scape-procedural-extensions