GNU Emacs is described as 'Extensible, customizable text editor—and more. At its core n interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing. The features of GNU Emacs include:' and is a very popular Code Editor in the development category. There are more than 100 alternatives to GNU Emacs for a variety of platforms, including Windows, Linux, Mac, BSD and Flathub apps. The best GNU Emacs alternative is Notepad++, which is both free and Open Source. Other great apps like GNU Emacs are Obsidian, Visual Studio Code, Sublime Text and VSCodium.