Asset Linker
A downloadable plugin
Godot 4 plugin for reusing assets in more than one project.
Assets are read from the environment variable ASSETS. If $ASSETS is undefined, it will be set to a folder in the persistent editor data folder called assets
($HOME/.local/share/godot/assets on linux,
%APPDATA%\Godot\assets on windows, or
~/Library/Application Support/Godot/assets on mac)
Untested on Windows and Mac.
Install instructions
Extract in your project's res://addons folder and enable in the project settings.