The main target of the Godot Engine are game developers. But Godot's easy workflow and functional UI elements, makes it also a good fit for non-game applications. There are already some out there you may know, like Pixelorama, an Open Source 2D sprite editor.
Is there a good way to make a redux-like central state container in Godot?
(I'm sure there are many ways to do it but wondering if there is someone who has found a good practice for it.)
You could pretty easily do this as an autoload so it's accessible from anywhere. You could store the actual state as a dictionary or a resource, or even a whole db if you wanted depending on what you're storing.
It's a little old but looks like someone even implemented a redux inspired store! https://github.com/glumpyfish/godot_redux
No idea if that still works, but probably would be too hard to use it as inspiration or even update it to the latest 3.x version