The Graph Toolkit provides a graph-based framework for creating your own node-based tools in the Unity Editor. 

Create tools that enable non-technical teammates to build game systems without having to access code. Check out the full length tutorial here: https://www.youtube.com/watch?v=hPtZzoThU_g

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Unity

A quick walkthrough of Unity's Graph Toolkit, a framework for building node-based tools inside the Unity Editor. The guide demonstrates setting up a visual novel sample by adding a start node, connecting dialogue nodes, and using a two-option node to branch storylines. It also covers how to swap in a custom graph on a canvas and test it during play mode.

Unity Tips: Graph Toolkit