Thank you very much for this recommendation! Most of my work is in Xcode, and in an ideal world Xcode would just support third-party syntax highlighting (or LSP), and I've been looking for a Mac-assed simple editor for those scenarios where I just want basic syntax support for a random text file. CotEditor is perfect!

The built-in TextEdit (in plain text mode) is also a perfectly cromulent minimum viable text editor.

I wonder if anyone has taken the source of TextEdit [1] and added some minor niceties to just make it slightly more convenient for text editing (like adding line numbers).

[1] https://developer.apple.com/library/archive/samplecode/TextE...

Not a textedit fork, but I am building a minimal text editor with niceties based on scintilla. So performance wise on par with Notepad++ et al.