SmallDevTools - Handy developer tools with a delightful interface
Atomize by Quarkly - Library for creating atomic react components
Google Open Source - All of Googles open source projects under a single umbrella
React Rainbow Components - Build your web application in a snap.
whatdevsneed - This is whatdevsneed.
Ant Design - An enterprise-class UI design language and React implementation with a set of high-quality React components, one of best React UI library for enterprises