The new Notepad lets you write Markdown without installing anything. It works with plain text, keeps your syntax visible, and ...

If you are running a supported version of Windows and use Notepad, you should try the AI-powered Rewrite feature. It is now limited to rewriting text, but coding support may come as it evolves.

XML Notepad 2007 is themed around the same kind of just-the-text-ma'am simplicity of Windows' Notepad, but does add relevant features for markup language hacking.