CotEditor - Open Source Plain-Text Editor for OS X
Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++
Lines code editor - Lines is a modern and minimalist text editor - IDE with support for over 150 programming languages, embedded code inspectors and many other cool tools to help you write better code.
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft