FoldingText!

Notepad++ is a free source code editor and Notepad replacement that supports several languages.

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.

GNU Emacs is an extensible, customizable text editor—and more. At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing. The features of GNU Emacs include:

Write! is a distraction-free text editor that boosts your productivity. It supports markdown syntax, spell-checker, cloud integration and much more!

Workflowy lets you organise your brain into easily manageable lists. It also works as a single-pane outliner with inline notes. It offers one-click hoisting (zooming into branches). The online version syncs with mobile apps.

Text editor for the KDE desktop environment with support for multiple languages and syntax highlighting. It is extensible with plugins. Features a MDI interface.

Komodo Edit is a fast, smart, free and open-source code editor. Switching your trusty code editor is hard, but give Komodo Edit (or its big brother Komodo IDE) a try: it'll be worth your while.

Aptana Studio is a complete web development environment that combines powerful authoring tools with a collection of online hosting and collaboration services that help you and your team do more. Includes support for PHP, CSS, FTP, and more...

TextMate brings Apples approach to operating systems into the world of text editors. By bridging UNIX underpinnings and GUI, TextMate cherry-picks the best of both worlds to the benefit of expert scripters and novice users alike.

Coda is a fast, clean, and powerful text editor with pixel-perfect preview and a built-in way to open and manage your local and remote files. And a dash of SSH too.

PSPad is a freeware programmers editor in 8 languages for Microsoft Windows operating systems. Some features are highlighted syntax, ftp, projects and so on. Code explorer for Pascal, C/C++, INI, HTML, XML, PHP and more in development, internal web browser with APACHE support. Installation contains templates for HTML, PHP, Pascal, JScript, VBScript, MySQL, MS-Dos, Perl.

Bluefish is a powerful editor targeted towards programmers and webdesigners, with many options to write websites, scripts and programming code. Bluefish supports many programming and markup languages, and it focuses on editing dynamic and interactive websites.