Semantic UI
A UI Component library implemented using a set of specifications designed around natural language
16 Alternatives To Semantic UI
Angular Material
Angular Material is both a UI Component framework and a reference implementation of Google’s Material Design Specification.
Bootstrap
Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Bulma
Bulma is an open source CSS framework based on Flexbox and built with Sass. It’s 100% responsive, fully modular, and available for free.
Element UI
Element, a Vue 2.0 based component library for developers, designers and product managers.
Foundation
The most advanced responsive front-end framework in the world
Gridlex
Simple. Robust. Responsive. Flexible.
GroundworkCSS
Responsive HTML5, CSS and JavaScript Framework
HTML5 Boilerplate
A rock-solid default for HTML5 awesome.
Material-UI
A CSS Framework and a Set of React Components that Implement Google’s Material Design
Purecss
A set of small, responsive CSS modules that you can use in every web project.
Spectre
Spectre is a web application to diff screenshots.
UIKit
A lightweight and modular front-end framework for developing fast and powerful web interfaces
Vuetify
Material Component Framework for VueJS 2
Webix UI
An enterprise JavaScript Library for cross-platform app development with HTML5 JavaScript widgets and easy integration with most popular JavaScript Frameworks.
w2ui
W2UI is a small JavaScript UI library with a complete set of widgets: layout, grid, sidebar, toolbar, tabs, fields, popup, utilities.