Best React.js UI Frameworks
Ant Design of React

Following the Ant Design specification, we developed a React UI library antd that contains a set of high quality components and demos for building rich, interactive user interfaces.

Element-React

Element UI for react.js

Semantic UI React

The official Semantic-UI-React integration

Elastic UI framework

a design library in use at Elastic to build internal products that need to share our aesthetics.

Evergreen

Evergreen is a React UI Framework for building ambitious products on the web. Brought to you by Segment.

Blueprint

A React-based UI toolkit for the web

Sancho UI

a responsive and accessible design system for the web. It's built with React, Typescript and Emotion

Base Web

Base Web React UI Framework

PrimeReact

The Most Complete UI Framework for REACT

instructure-ui

To build an accessible application using the React components, themes, and utilities

Shopify Polaris

Our style guide helps us collaborate across disciplines to build a great experience for all of Shopify’s merchants. It promotes consistency, but it’s not a blueprint. Be creative, explore, and evolve the system.

Reakit

Toolkit for building accessible UIs

Ring UI

JetBrains Web UI components

Material-UI

A popular React UI framework

Shards React

a High-Quality & FREE React UI Kit based on Bootstrap 4 Featuring a Modern Design System and Dozens of Components

React Bootstrap

The most popular front-end framework Rebuilt for React.

Elemental UI

A flexible and beautiful UI framework for React.js