This is an integration of the FastNoise C++ library for Godot Engine. It uses Simplex Noise for some of its generators, which is patented for image generation. If you want to avoid the patent, you can try OpenSimplex, for which I also made a module.
I still prefer FastNoise because it has more features, doesn't allocates dynamic memory and works with a single class.
This branch tries to follow godot's master branch (as much as I have time).
For different godot versions look at the other branches.
Status for this branch: Update for 4.0 is work in progress.
You have to get the source code of Godot to compile it with the module. Copy the contents of the repository inside a fastnoise directory under Godot's modules folder. The name is important for the module to compile properly.
Example git command: git clone https://github.com/Relintai/godot_fastnoise.git fastnoise