GNU Emacs is a free, powerful, extensive, and customizable text editor. It can be used to edit code, take notes, or even write novels.

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Emacs is one of the oldest editors still used by developers. Since it has been around for a lot of time, it has become one of the most feature-rich text editors. Additionally, it is highly customizable because it's built on a Lisp interpreter. It allows users to tailor the editor to their specific preferences and needs. GNU Emacs is popular among developers and programmers due to a wide range of features: code completion, syntax highlighting, support for a variety of programming languages, and more. This allows its users to do a lot of tasks, including customizing the work environment, creating and working with documents, code formatting, and managing files.

Conclusions

It may take some effort for beginners to get grips with GNU Emacs. However, it is an excellent tool for programming, editing texts, and other tasks. It's a good choice for those who look for a powerful, versatile, and highly-customizable editor with rich functionality.