Responsable has been discontinued. Similar apps include Bootstrap, which is free and open source. Other options are Tailwind CSS, Foundation, Material UI and Materialize. CSS Frameworks like Responsable are a crowded field, with more than 50 alternatives for the web, self-hosting, Mac, Windows and Linux.
A set of beautifully-designed, accessible components and a code distribution platform. Works with your favorite frameworks. Open source. Open code.
Front-end framework with a built-in dark mode and full customizability using CSS variables; great for building dashboards and tools.
Eva Design System is a free and open-source, customizable design system. Available for Sketch with Mobile and Web component libraries.
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Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.
Little Widgets is a collection of beautifully designed HTML website widgets and popups. It’s coded, responsive, animated and ready to use on your website.
GroundworkCSS is a 100% free and open source responsive HTML5, CSS and JavaScript Framework.
The Goldilocks Approach to Responsive Web Design - A good starting point for design that takes device resolution out of the equation.
A grid system for responsive web design. Includes folding columns, elastic gutters, a zoomable baseline grid, and a delightful grid overlay script.
Google's front-end web framework for building sites to the Material Design specification.
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