Webflow.com (an online visual site builder) allows you to design your project/ site (some templates included, but there is still plenty of room for creativity), then the app produces the code behind your design and you can download it. The free version allows you to download only parts of your work.
An than, there is Mobirise.com. This is another online VISUAL tool (drag and drop blocks) for designing sites in the Bootstrap family. The basic plan is free. They have an interesting pro-plan.