This is an ES6-ified version of @jxnblk's React Static Site Boilerplate project. It's largely the same, just using the babel-loader plugin for Webpack.
See the original article here: http://jxnblk.com/writing/posts/static-site-generation-with-react-and-webpack/
Update: You might find react-static-boilerplate to be a more complete/coherant option.
MIT License