LEO

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 An Open source Linux "meta-structural" editor

 Author:   Alexander V. Lukyanov
 Homepage:https://leoeditor.com/ 
 Source code: https://github.com/leo-editor/leo-editor
 Family:   CuaFamily LinuxEditorFamily OutlinerFamily
 License:  Open source
 Platform: Linux Windows Mac OS/X

So this text editor allows you to manipulate outlines of information as well as regular text. It is 100% Python.

 Screenshot: