The best open source alternative to TextEdit is gedit. If that doesn't suit you, our users have ranked more than 100 alternatives to TextEdit and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to TextEdit are GNU nano, TextMate, CudaText and Aptana Studio.
Extensible text editor with UTF-8 support, syntax highlighting for several programming and markup languages, remote editing, file reverting, print preview, clipboard operations, powerful search, customizable fonts and colors, line numbering, and plugin support.
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.
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.
CudaText is a cross-platform text editor, written in Lazarus / Free Pascal.
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...
CodeEdit is a code editor built by the community, for the community, written entirely and unapologetically for macOS. Features include syntax highlighting, code completion, project find and replace, snippets, terminal, task running, debugging, git integration, code review...
Lightweight Mac scratchpad and clipboard manager featuring multi-tab editing, 1,000-item clipboard, syntax highlighting for 185+ languages, local privacy-focused storage, global hotkeys, split view, clickable links, iCloud sync, auto-save, and minimal resource usage.
Block-organized, privacy-focused scratchpad for developers with language-specific syntax highlighting and auto-formatting, supporting JavaScript, JSON, Markdown, notes, API responses, and daily planning, all in a persistent local buffer with minimalist interface.
SciTE is a SCIntilla based Text Editor. Originally built to demonstrate Scintilla, it has grown to be a generally useful editor with facilities for building and running programs. It is best used for jobs with simple configurations - I use it for building test and demonstration...
Syntax Highlighting: Colorize more than 50 pre-installed major languages like HTML, PHP, Python, Ruby or Markdown. You can also create your own settings.
A cross-platform, reimplementation of Notepad++. Releases are available for Windows, Linux, and macOS.
A text editor forked from Pluma and Gedit. Xed is the default text editor of Linux Mint. It can be customized and is available in multiple languages.
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Text Edit is capable of producing RTF documents while this program is mostly for programming therefore under that aspect is not close at all