NFL - The National Football League. They have contributed a lot to React Ecosystem. From their Medium post:
The National Football League adopted React in December of 2014. For the past year we have iterated and built on React’s core concepts, various Flux implementations, JSX, Babel, experimental proposals, and functional approaches. You name it and we’ve probably evaluated it and possibly use it in production. Read on for a review of the NFL’s year in React. medium.com/nfl-engineers/nfl-react-84e9cd11d384