EZ React
This is the most minimalistic ReactJS config imaginable. It contains React, Webpack and ES2015 and is only 38KB gzipped.
It also comes equipped with a ready-2-go express config for both local dev (with hot reloading) and for publishing your public folder (configured for Heroku).
Stats
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Babel 6
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React 0.14
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Webpack
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Hot reloading
Size: 38KB