HTML5 Please - Look up HTML5, CSS3, etc features, know if they are ready for use, and if so find out how you...
NativeBase - Experience the awesomeness of React Native without the pain
Can I use - Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers.
React Native UI Kitten - Customizable and reusable react-native component kit
CodeToGo - Find updated snippets for common JavaScript use cases
React Native Starter - React Native Starter is mobile application template built with React Native that contains essential components for all mobile apps.