Notepad++ is a free, open-source code editor supporting several languages, offering features like syntax highlighting, plugin support, dark mode, portability, privacy, and efficient resource usage, making it highly customizable and suitable for various programming needs.

The Kate project develops two main products: KatePart, the advanced editor component which is used in numerous KDE applications requiring a text editing component, and Kate, a MDI text editor application.

Official text editor of the GNOME desktop environment. Has syntax highlighting and is suitable for programming, with support for several languages. It is extensible with plugins.

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:

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.

Manage your thoughts and projects with infinite levels of indentation, easy syncing with mobile apps, and features like hoisting and inline notes. Suitable for personal use, task management, and seamless team collaboration.

Notepad3 is a fast and light-weight text editor with syntax highlighting for programming jobs. Auto-completion, Multi-language, Dark mode more.

TextMate brings Apple's 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.

Fast, streamlined editor with extensive features, bundled with Windows since 1985. Supports plain text, UTF-8, and over 100 languages with enhanced functionality since 2018, including dark mode, Bing search, and large file handling.

Rentry.co is a markdown pastebin and publishing service with preview, custom urls and editing. Fast, simple and free.

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...

UltraEdit is the ideal text, HTML and HEX editor, and an advanced PHP, Perl, Java and JavaScript editor for programmers. An industry-award winner, UltraEdit supports disk-based 64-bit file handling (standard) on 32-bit Windows platforms (Windows 2000 and later).