a ridiculously small responsive css framework
Skeleton: A Dead Simple, Responsive CSS Boilerplate for Mobile-Friendly Development
A tool for developing responsive websites crazy-fast.
Open sourced : https://github.com/kitze/sizzy
Automated testing of look and feel for your responsive websites.
Layout testing seemed always a complex task. Galen Framework offers a simple solution: test location of objects relatively to each other on page. Using a special syntax and comprehensive rules you can describe any layout you can imagine.
Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.
lightweight and clean starting point for your project and prototype
flexbox, responsive and mobile-friendly layout
carefully designed elements
built in useful components and utilities
MJML is a markup language designed to reduce the pain of coding a responsive email. Its semantic syntax makes it easy and straightforward and its rich standard components library speeds up your development time and lightens your email codebase. MJML's open-source engine generates high quality responsive HTML compliant with best practices.
Breaking CSS is easy. Checking every responsive page element is hard. That’s why there's BackstopJS.
A Responsive Email Framework from ZURB. Quickly create responsive HTML emails that work on any device & client. Even Outlook.
A collection of patterns and modules for responsive designs.
A lightweight, pure JavaScript library for responding to CSS media queries.
Tips, Resources and Patterns for Responsive Web Design
An easy to use, powerful, and flexible framework for building prototypes and production code on any kind of device.