Native Starter Pro
Native Starter Pro is a bold and flexible theme best suited for developing high-quality mobile apps that makes use of ready-made tools. The theme has several widget areas that allows you to extend your theme functionality with plugins. Native Starter Pro built using Redux and Mobx, is performance optimized which helps you to develop world-class application experiences on native platforms. This gives your app a consistent look and feel with the rest of the platform ecosystem, and keeps the quality bar high.
Native Base is a free and open source UI library that enables developers to build high-quality mobile apps using React Native iOS and Android app with a fusion of ES6. NativeBase builds a layer on top of React Native that provides you with basic set of components for mobile application development.