The Scene Graphs plugin adds a visual, graph-based editor for nodes, signals and node references. Views are configurable and persistent, so you're in control of exactly how much or how little information you see in the graph. This plugin is moddable, too! You can write scripts to add functionality to the graph to serve the particular needs of your project without editing plugin files directly.

Link to repo: https://github.com/GeneryDev/scene-graphs

Link to modding documentation: https://github.com/GeneryDev/scene-graphs/wiki/Modding

List of features

• Method-Signal connections: You can connect and disconnect signals by dragging between the corresponding ports.
• Connection flag and bound argument editing without a modal UI: By selecting the arrow in the middle of signal connections, you can edit flags such as Deferred and One-Shot, and bound arguments in the inspector. You can even edit multiple connections at once!
• Node Reference connections: You can view and edit NodePath and Node-derived exported variables as connections on the graph.
• Property Inspectors: You can embed pretty much any property directly into the graph and have it display as an editable inspector property.
• Connection handles: If the graph gets too complicated and tangled, you can drag the handle in the middle of any connection to redirect the connection line.
• Views: Save multiple views, for each different way you want to look at your scene. Each view has a set of configurable rules for all of the features listed above. Views can also be either local to the scene, or global to the project.
• Hooks! This plugin is moddable! Most of the features in this plugin are actually built-in hook scripts. The core of this plugin is a rather small, featureless GraphEdit with a View Manager UI to configure hooks, so this functionality can easily be extended. Documentation for hooks is here.
• Also, small thing: you can choose whether this plugin acts as a main screen plugin (with a tab at the top next to 2D/3D/Script/Asset Store) or as an editor dock (dockable anywhere else in the window).