If you are building business apps with React, I created a reference application with React and the Lightning Design System: the new language, framework, and vendor-independent CSS toolkit from Salesforce that provides a set of UI components, UI patterns and guidelines focused on Business/Enterprise app development.
Check out this video for a quick walkthrough:
The application is built with:
- Lightning Design System
- ECMAScript 6 including modules
- Babel to transpile the ECMAScript 6 code
- Browserify to support modules in your current browser
- A Postgres database
The source code and installation instructions are available in this GitHub repo.