React Components http://react-components.com/
Khan Academy - React Components https://sites.google.com/a/khanacademy.org/forge/for-developers/react-components
Material UI - React Components for Google Material Design http://material-ui.com/
React.rocks - component examples http://react.rocks/
React component library https://react.parts/web
react-controllables - easily create controllable components. https://github.com/matthewwithanm/react-controllables
React-select - a flexible and beautiful Select Input control for ReactJS with multiselect, autocomplete and ajax support. https://github.com/JedWatson/react-select