Awesome

react-makes-you-sad

Here’s a flowchart to make you happy again!

If you are confused by the React ecosystem and don’t know where to start, read <a href="https://github.com/petehunt/react-howto" target="_blank">Pete Hunt’s react-howto guide</a>.
If you are using a Flux library (or Redux) and it adds a lot of boilerplate for no obvious gain, remove it and learn state management in vanilla React with the official <a href="https://facebook.github.io/react/docs/thinking-in-react.html" target="_blank">Thinking in React</a> guide.
If you don’t feel comfortable using ES2015 features (e.g. classes and fat arrows) and you feel like updating your JavaScript knowledge, <a href="https://leanpub.com/understandinges6/read" target="_blank">Understanding ECMAScript 6</a> is an amazing guide. Use <a href="https://babeljs.io/repl/" target="_blank">Babel</a> to verify your assumptions.
If you are just learning React, and a JavaScript bundler like Webpack confuses you, copy <a href="https://github.com/jarsbe/react-simple" target="_blank">jarsbe/react-simple</a> and start hacking with no build step.
After you’ve learned React itself you can begin learning good deployment practices such as using JavaScript bundlers. Use Google Page Speed to assess how well your app delivers the client code.

On OSX with Homebrew, merely do brew install graphviz.
Otherwise, it's probably in your OS's package repositories as simply graphviz.
You can also get an installer from the Graphviz downloads page.