React is a popular JavaScript library for building user interfaces, and there are many third-party libraries and tools that can enhance your development experience. While the specific libraries you need may depend on your project requirements, here is a list of 20 React libraries and tools that many developers find valuable:

1)React Router:

A popular routing library for handling client-side routing in React applications.
GitHub: https://github.com/ReactTraining/react-router

2)Redux:

A predictable state container for managing global application state.
GitHub: https://github.com/reduxjs/redux

3)React-Redux:

Official React bindings for Redux to simplify state management in React applications.
GitHub: https://github.com/reduxjs/react-redux

4) Axios:

A promise-based HTTP client for making API requests in React applications.
GitHub: https://github.com/axios/axios

5)Material-UI:

A popular UI framework for building responsive and accessible web applications.
GitHub: https://github.com/mui-org/material-ui

6) Styled-components:

A library for styling React components using tagged template literals.
GitHub: https://github.com/styled-components/styled-components

7)React Query:

A library for managing and caching server state in React applications.
GitHub: https://github.com/tannerlinsley/react-query

8)Formik:

A form-handling library for building forms in React applications with ease.
GitHub: https://github.com/formium/formik

9)Yup:

A schema validation library that works seamlessly with Formik for form validation.
GitHub: https://github.com/jquense/yup

10)React Icons:

A collection of popular icon libraries as React components.
GitHub: https://github.com/react-icons/react-icons

11) React Query Devtools:

A set of devtools for inspecting and debugging React Query in your application.
GitHub: https://github.com/tannerlinsley/react-query/tree/master/experimental/devtools

12) React Transition Group:

A set of components for adding CSS transitions and animations to your React components.
GitHub: https://github.com/reactjs/react-transition-group

13) React Helmet:

A library for changing the document head in your React application for SEO and other purposes.
GitHub: https://github.com/nfl/react-helmet

14)React Testing Library:

A testing library for writing accessible and maintainable React component tests.
GitHub: https://github.com/testing-library/react-testing-library

15)Enzyme:

A JavaScript testing utility for React that allows you to easily test React components' output.
GitHub: https://github.com/enzymejs/enzyme

16)React-i18next:

A library for internationalization (i18n) in React applications.
GitHub: https://github.com/i18next/react-i18next

17)React Query Devtools:

A set of devtools for inspecting and debugging React Query in your application.
GitHub: https://github.com/tannerlinsley/react-query/tree/master/experimental/devtools

18) React Hook Form:

A library for managing forms with React hooks, with performance and simplicity in mind.
GitHub: https://github.com/react-hook-form/react-hook-form

19)React Query Devtools:

A set of devtools for inspecting and debugging React Query in your application.
GitHub: https://github.com/tannerlinsley/react-query/tree/master/experimental/devtools

20)Framer Motion:

A library for adding smooth animations and transitions to your React components.
GitHub: https://github.com/framer/motion