Dialoguer - A Dialogue Creator Tool For Unity - Unity Forum
How to Make Custom Unity Editor Tools (Editor Contextual Tools)?
Editor Scripting - Unity Learn
Extending Unity with Editor Scripting: Put Unity to use for your video games by creating your own custom tools with editor scripting: Tadres, Angelo: 9781785281853: Amazon.com: Books
Using custom Editor tools - Unity Manual
Unity 2020.1 - New programmer tools and features | Unity
Create immersive authoring tools in Unity EditorXR
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If you make Unity Editor tools, try the new Editor Foundations Design System: This covers helpful guidance, best practices, and other resources to help users build a better Editor UI. : r/Unity3D