Carrd lets you build one-page sites for pretty much anything, whether it's a personal profile, a landing page to capture emails, or something more elaborate. It's simple, responsive, and totally free.
Startup Framework 2.0 is a tool that allows you to create a beautiful and responsive website in under 60 minutes.
Snappykit is a new way of creating websites for mobile apps.
Evie is a small and MIT licensed framework with pages out of the box, to build websites faster. It is extemely lightweight, customizable and works perfectly on modern browsers. Created and used in production at unDraw with great loading times! Hope you'll find it useful!