Recharts - Redefined chart library built with React and D3
Tetrisly - Starter kit for design systems and wireframes builder (Sketch/Figma)
NativeBase - Experience the awesomeness of React Native without the pain
Framer - 🔥 Design real websites right on the canvas.
Reakit - A toolkit to build accessible web apps with React
Flawwwless ui - Simplified open source React.js components library 🚀