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GNU Emacs is an extensible and customizable, free and open source text editor. It was created by GNU Project founder Richard Stallman and has been dubbed "the most powerful text editor available today". At the core of GNU Emacs is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing. Which allows users to extend and customize GNU Emacs to their heart's content.

With RubyMine you can produce high-quality code more efficiently, thanks to first-class support for Ruby and Rails, JavaScript and CoffeeScript, ERB and HAML, CSS, Sass and Less, and more. RubyMine is IDE specifically designed for the programming language Ruby. It allows developers to take advantage of the language specific-aware syntax & error highlighting, code formatting, code completion, and quick documentation.

Over 4 million people use UltraEdit for their development needs. UltraEdit is flexible, powerful, and secure text editor that provides powerful and intuitive multi-caret editing and multi-selection capabilities, HTML and Markdown live preview, advanced file and folder search, horizontal editing through column mode and much more. UltraEdit also integrates with FTP, SSH and Telnet, making it easy to push your code to remote servers without CI/CD. The software is available for Windows, Mac, and Linux.

A free and open-source IDE for macOS, Linux, and Windows developed by GitHub Inc. The application is build on the Electron framework and provides a wide eco-system of add-ons that can be used to extend the IDE further. Atom is loved by developers across the globe.

A loved text editor and IDE for web developers and designers that provides unmatched responsiveness. Sublime Text provides a wide selection of editing command including indenting or un-indenting, paragraph reformatting, line joining , multiple selections, regular expression search and replace, incremental find as you type, and preserve case on replace. The IDE can also be extended with community built packages to further improve language detection, auto-complete and intellisense features.

A free and open source IDE based on Electron and Atom, developed by Microsoft. Visual Studio Code or VS Code is an extensible IDE or coding editor that is loved by many developers around the globe. The editor combines a streamlined UI with advanced code assistance, code nagivation and intellisense.