CotEditor

Syntax Highlighting: Colorize more than 50 pre-installed major languages like HTML, PHP, Python, Ruby or Markdown. You can also create your own settings.

Free
Open Source
Mac OS X

syntax highlighting: colorize more than 50 preinstalled major languages like html, php, python, ruby or markdown. you can also create your own settings.

scriptable: make your own macro in your favorite language, whether it is python, ruby, perl, php, unix shell, applescript or javascript.

outline menu: extract specified lines with the predefined syntax, and you can jump to the corresponding line.

powerful find & replace: super powerful find and replace using the icu regular expression engine.

split editor: split a window into multiple panes to see different parts of your document at the same time.

incompatible characters: check and listup the characters in your document that cannot convert into the desired encoding.

cjk language friendly: estimate various file encodings accurately, toggle to vertical text mode and keep its line height correctly.

open source: coteditor is developed as an opensource project that allows anyone to contribute. (github https://github.com/coteditor/coteditor )

Links to official CotEditor sites

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File Versioning Colored Text macOS like

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CotEditor

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