Notepad++ - This is the definitive notepad-related software you’ll ever need. Multiple tabs, keeps tracks of lines, lots of features and preferences. One of the most invaluable parts of it, is that you can close it or a update happens or maybe your PC will get knocked offline. You can come back to Notepad++, open it, and everything will be retained.
Vim. I suppose, technically, I’d need a kernel and filesystem drivers to run it, but Vim is the one true way. (and none of that neovim heresy either!)