Design Blocks is a free set of more than 170 responsive components in HTML for assembling a website or an hybrid app in minutes.
Design blocks is basically an UI kit providing a wide range of components and layouts such as headers, footers, sections, forms, CTAs, pricing tables, testimonials, etc. Modules are based on Bootstrap 4 and use Roboto as typeface by default, but you can easily replace that with any other free font from Google Fonts library.
In short, this is a great resource for building static websites and landing pages in a couple of hours or less. Only a basic HTML/CSS knowledge is required!