CotEditor

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 The Lightweight plain-text editor for macOS.

 Author:    Mineko Imanishi
 Homepage:  https://coteditor.com/
                  https://github.com/coteditor/CotEditor
 Download:  https://apps.apple.com/app/coteditor/id1024640650
 Family:    -
 Platform:  macOS
 License:   Apache License 2.0

Features:

Syntax highlighting including more than 50 preset languages
Powerful find and replace with the regular expression
Auto-backup with/without overwriting actual document files
Line numbers view
Character inspector that shows the zoomed glyph and Unicode information
Various Unicode normalizations
Scriptable with your favorite language
JCK-languages friendly

 Screenshot: