[Adobe Muse] is pretty decent from my first rough sketch in the site – its code is a bit of a wreck, but not much worse than the kind of automatically-generated code from within WordPress or Tumblr, two of the most broadly-adopted tools designers are using.
WordPress produces basically-OK code by default if you just type away in its textarea – the way most people us it, and the way nobody should. You can’t easily insert headings unless you know about them already, a serious issue.
Tumblr is absolutely hopeless even as autistic savant David Karp swans around in classic cars.