boilerplate.react.spa.full-server by the0neWhoKnocks

Extremely simple boilerplate, easiest you can find, for React application including all the necessary tools: Flow | React 16 | redux | babel 6 | webpack 3 | css-modules | jest | enzyme | express + optional: sass/scss. Maintained by werein on GitHub, where it has earned 287 stars from the community.

A Full MERN Stack Boilerplate for Web Apps including a local authentication system. Uses React, Express.js, MongoDB, Redux, Passport.js, Webpack, Testing, and more. Maintained by djizco on GitHub, where it has earned 286 stars from the community.

A React+Redux boilerplate using Express as backend, UIKit for frontend, MongoDB for storage & Passport for auth. Maintained by rastenis on GitHub, where it has earned 60 stars from the community.