Free Unity Editor Tool: xNode Node Graph Framework (Siccity)

Overview

Thor Brigsted (Siccity) shares xNode, a framework for developing node-based plugins and node graphs in Unity. With a minimal footprint it is meant as a base for custom state machines, dialogue systems and decision makers.

Key features listed in the README are a lightweight runtime, very little boilerplate code, strong separation of editor and runtime code, no runtime reflection unless graphs are edited at runtime, and no reliance on third-party plugins. It installs as a package through a git URL or by unpacking the archive into a project, with small example projects in an examples branch, and it is free under the MIT license.