Preview your React components directly in Atom. Works best for stateless components.
Like hot reloading, but within Atom!
apm install atom-react-preview
Go to "Install Packages" and search for atom-react-preview
Press CTRL-SHIFT-M
in the editor to open the preview pane.
Thanks to https://github.com/webBoxio/atom-html-preview which 90% of the code is coming from. It got me to understand how Atom packages works and served as a base for this package. Thanks @webBoxio!