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CodeLite

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.

TextWrangler is an all-purpose text and code editor for macOS. TextWrangler is now BBEdit.

gedit is a free and open source IDE native to the GNOME desktop environment. With gedit you can work with a wide range of programming languages including C, C++, Java, JavaScript, HTML, XML, Python and Perl. The IDE automatically detect programming language and provide code color highlighting accordingly. It also include features like search and replace, spell checking, printing and support for most filte types.

With Coda you can code for the web. It's a powerful text editor that allow you to write fast and clean code while enjoying pixel-perfect preview with hot reload. Code include features found in many IDEs and include built-in jways for opening and managing files both locally and remote, with the inclusion of SSH connection capabilities.