WebUI

Mobile-first CSS and JavaScript front end framework that supports responsive mobile first and fixed desktop layouts.

7 Alternatives To WebUI

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Bootstrap

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

The most advanced responsive front-end framework in the world
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Material-UI

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

Semantic UI

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

Spectre

Spectre is a web application to diff screenshots.
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UIKit

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