Hi!
I already submitted repo to the Asset Library, but dedicated thread may be helpful as well ;)
Zara is a survival framework written in independent C# that allows you to get out-of-the-box complex weather-aware health system, inventory with crafting; diseases, injuries, sleeping mechanics, and much more.
Saving and loading everything, including inventory, is also fully supported.

Complete description and detailed wiki, as well as Godot sample project, you can find on Zara github page.

I'm not proficient in Godot, I know pretty much only basics, but I gladly will answer any Zara-related questions, because this framework is engine-independent and works the same on Unity, cryengine, Godot or anywhere else)
I hope some of you will find Zara helpful in some way :)