CotEditor (https://coteditor.com https://coteditor.com) is a well written, open-source (https://github.com/coteditor/CotEditor https://github.com/coteditor/CotE

CotEditor (https://coteditor.com https://coteditor.com) is a well written, open-source (https://github.com/coteditor/CotEditor https://github.com/coteditor/CotEditor), lightweight, native (Swift), lightweight plain-text editor that many Chinese, Japanese, and Korean developers love to use. I highly recommend it.