Gumby

A Flexible, Responsive CSS Framework - Powered by Sass

BEM

BEM — Block Element Modifier is a methodology, that helps you to achieve reusable components and code sharing in the front-end.

Simple and flexible HTML, CSS, and JS for popular UI components and interactions

Bulma is an open source CSS framework based on Flexbox and built with Sass. It’s 100% responsive, fully modular, and available for free.

The most advanced responsive front-end framework in the world

5th major revision of the core language of the World Wide Web

Google Material Design

Material Design Lite Components in HTML/CSS/JS

Material Design for AngularJS Apps

Material Design for Bootstrap is a Bootstrap compatible theme for use in Bootstrap based application.

A CSS Framework and a Set of React Components that Implement Google’s Material Design

Polymer is a library that uses the latest web technologies to let you create custom HTML elements.

A set of small, responsive CSS modules that you can use in every web project.

SPA front-end on steroids.

A collaborative developer hub for your API or code.

A UI Component library implemented using a set of specifications designed around natural language

A lightweight and modular front-end framework for developing fast and powerful web interfaces

Material Component Framework for VueJS 2