Tetrisly - Starter kit for design systems and wireframes builder (Sketch/Figma)
Atomize by Quarkly - Library for creating atomic react components
Framer - 🔥 Design real websites right on the canvas.
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
Flawwwless ui - Simplified open source React.js components library 🚀
React Bootstrap - 700+ UI components & templates for Bootstrap 5 & React 17