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NetBSD isn't the first to use the name. My pet text editor is also called atto: https://git.levitati.ng/Levitating/atto

And before you was: https://github.com/makuke1234/atto, which notes its name originating from A Truly Tiny text editOr.

Also used by Moodle, the open source LMS: https://docs.moodle.org/400/en/Atto_editor