NotepadNext is described as 'A cross-platform, reimplementation of Notepad++. Releases are available for Windows, Linux, and macOS'. There are more than 50 alternatives to NotepadNext for a variety of platforms, including Windows, Mac, Linux, BSD and Chrome OS. The best alternative is Visual Studio Code, which is free. Other great apps like NotepadNext are Notepad++ (Free, Open Source), Atom (Free Personal, Open Source), Sublime Text (Paid) and Vim (Free, Open Source).
Visual Studio Code is more than just a code editor, it provides the tools and extensions to compile, debug, compare, refactor, and even manage code repositories all within a highly-customised development environment.
The Kate project develops two main products: KatePart, the advanced editor component which is used in numerous KDE applications requiring a text editing component, and Kate, a MDI text editor application.
GNU nano is a small and friendly text editor. Besides basic text editing, nano offers many extra features like an interactive search and replace, go to line and column number, auto-indentation, feature toggles, internationalization support, and filename tab completion.