Components
https://react.rocks/
https://github.com/brillout/awesome-react-components
http://khan.github.io/react-components/
https://material-ui.com/ru/

Components Office Design
https://github.com/microsoft/fluentui

Twitter Bootstrap components
https://react-bootstrap.github.io/

JS-packages
https://js.coach/

Blessed terminal interface visualizer
https://github.com/chjj/blessed
https://github.com/Yomguithereal/react-blessed

ART package visualizer
https://github.com/sebmarkbage/art
https://github.com/facebook/react/tree/master/packages/react-art

three.js 3D-lib visualizer
https://threejs.org/
https://github.com/pmndrs/react-three-fiber

Data models and server side
https://github.com/reflux
https://redux.js.org/
https://www.meteor.com/
https://github.com/facebook/flux

Routing libs
https://github.com/ReactTraining/react-router