Recently I improved the UX in my fractal tool. If you’re interested in stuff like the Mandelbrot fractal, you may love my tool (and if e.g. Mandelbulber isn’t better suited). It’s particularly useful to create tilesets and 3D imagery.
It opens in vanilla Godot, i.e. with no C# or any other extras required. (At least it does on Linux; feedback on e.g. Windows is welcome.)