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. 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 list-up 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 open-source project that allows anyone to contribute. (GitHub https://github.com/coteditor/CotEditor )
