I used Responsive Layout Maker in my College Graded Unit which was back in 2015. Also Webform Builder to create the contact form.
The one disappointment for me is that Webform Builder hasn't been severely upgraded to include CSS3. I am not a fan of Form Designer or the process of building in one and then duplicating in the other. The webform builder is the real kit and makes forms brilliantly and because it provides scripts this should have been the CC concentrated their work