Mobirise

Mobirise is a desktop application that runs on Windows and Mac, letting you build sites offline without a subscription. It ships with over 200 pre-built Bootstrap themes you can customize with drag-and-drop editing. The free version works for both personal and commercial projects with no licensing strings attached.

This fits developers and agencies who prefer offline-first workflows and don't want recurring fees. The Bootstrap foundation means responsive design is built-in, and you can export static HTML to host anywhere. It's a solid choice if you want complete control over your site files without vendor lock-in.