React libraries are collections of code that are specifically designed to be used with the React JavaScript library. These libraries contain pre-written code that can be imported into a React project to provide additional functionality or features. Some examples of popular React libraries include React Router, React Redux, and React Bootstrap.

React Router - a library for managing client-side routing and navigation in a React application

Redux - a state management library for managing complex application state in a predictable and organized manner

Axios - a library for making HTTP requests in a React application

Material-UI - a library for implementing Google's Material Design in a React application

Jest - a testing library for React applications

Enzyme - a library for testing and manipulating React components

Formik - a library for managing and validating form inputs in a React application

React Bootstrap - a library for implementing the Bootstrap framework in a React application

Styled Components - a library for writing and styling React components using CSS-in-JS

React-Lazyload - a library for implementing lazy loading in a React application to improve performance.