NativeBase - Experience the awesomeness of React Native without the pain
React Boilerplate - Offline-first, highly scalable foundation for your next app
React Native UI Kitten - Customizable and reusable react-native component kit
GatsbyJS - Blazing-fast static site generator for React
React Native Paper by Callstack - Material Design for React Native (Android & iOS)
Teutonic CSS - Here’s 12KB of CSS to jump start your HTML