ReactJS is for the front end of web/mobile apps. It can be used to render pages on it's own, or from within other frameworks such as MeteorJS or AngularJS. ReactJS code is JavaScript + HTML/JSX - (look at JSX as just a way to write HTML inside a JavaScript file).
ReactJS - Official Home Page: http://facebook.github.io/react/
Official ReactJS Example page: http://facebook.github.io/react/docs/examples.html
A simple Reddit Client with React JS - JSFiddle http://jsfiddle.net/ssorallen/fEsYt
ReactJS demo's & Mobile: http://facebook.github.io/react/blog/2013/12/30/community-roundup-13.html
React Rocks - tons of code samples and demo's: http://react.rocks/
Made with React - Showcase of apps using React or React Native: http://madewithreact.com/
Why I chose ReactJS ? http://giantelk.wordpress.com/2014/08/27/why-i-chose-reactjs/
5 Best Mobile Web App Frameworks: React | Modus Create http://moduscreate.com/5-best-mobile-web-app-frameworks-reactjs
Why We May Ditch AngularJS For React http://wiredcraft.com/posts/2014/08/20/why-we-may-ditch-angularjs-for-react.html
Moving Atom To React http://blog.atom.io/2014/07/02/moving-atom-to-react.html
The Secrets of React's Virtual DOM http://fluentconf.com/fluent2014/public/schedule/detail/32395
React PhoneCat: Rewriting the AngularJS Tutorial App in React Awesome overview of ReactJS with a great example app. http://jgebhardt.github.io/blog/react-phonecat/
Reactive table: http://www.phpied.com/reactive-table/
Remarkable React: http://www.phpied.com/remarkable-react/
Serverless Stack: http://serverless-stack.com
Step-by-step instructions with screenshots for creating a React.js single page CRUD app hosted on S3 and served out from CloudFront. Over 50 tutorials that take you all the way from creating your AWS account to setting up your app with your own domain.
Router for ReactJS: https://github.com/rackt/react-router
Reactify Transforms JSX to JavaScript via Node package, for use in build system i.e. with Gulp, Browserify or Wacherify. https://www.npmjs.org/package/reactify
Browserify Browser-side require() the node way. Allows you to separate JS files into modules, and use Node NPM packages on the client. https://www.npmjs.org/package/browserify
Watchify Watch mode for browserify builds. Automatically runs Browserify when files are changes/saved. https://www.npmjs.org/package/watchify
Stack Overflow Q&A for ReactJS Don't be put off by the small # of questions, ReactJS is so easy to learn that you're questions will be mostly about other parts of the app, i.e. JavaScript, CSS, backend stuff: http://stackoverflow.com/questions/tagged/reactjs
There's lot's of info on ReactJS on Twitter & Google+ and other social media sites
https://twitter.com/ReactJSNews
https://plus.google.com/communities/114822536557370957541
Reddit search for ReactJS: http://www.reddit.com/search?q=reactjs
Hacker News search for ReactJS: https://hn.algolia.com/?q=reactjs#!/story/forever/0/reactjs
Written for MeteorJS, but this is generic JavaScript so good for any JS project: https://www.discovermeteor.com/blog/javascript-for-meteor/
From videos to Components and more: https://github.com/enaqx/awesome-react
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