Enjoy the collection of best UI Frameworks available for the awesome React.js framework. Have listed top 5 Component Libraries/Frameworks base on GitHub starts
:

React components that implement Google’s Material Design.
With 34600 Stars it’s one if the most popular React UI library on GitHub.
Ant Design

A design system with values of Nature and Determinacy for better user experience of enterprise applications .
26500 Stars on GitHub.
Boostrap

React-Bootstrap is a library of reusable front-end components. You’ll get the look-and-feel of Twitter Bootstrap, but with much cleaner code.
12700 Stars on GitHub.