SubEthaEdit

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 A collaborative text editor for Mac OS X / macOS

 Author:  SubEthaEdit Contributors (main maintainer Dominik Wagner), previously Martin Ott, Martin Pittenauer, Dominik Wagner
 Homepage: https://subethaedit.net/
 Family:   MacintoshEditorFamily
 Platform: Mac OS X / macOS
 License:  Open Source, MIT

To quote the home page:

: SubEthaEdit has been developed with the developer in mind. It supports your all day coding work, with syntax highlighting, symbol navigation, auto-completion, regex search and replace and indenting.

 Screenshot: