redux-saga is a library that aims to make side effects (i.e. asynchronous things like data fetching and impure things like accessing the browser cache) in React/Redux applications easier and better. If you haven't learned sagas yet, here's a great place to start.
Rekit is a toolkit to create and manage a React + Redux + React-router based SPA project. It uses the feature oriented project folder structure. That is all code is organized by features. There is a folder for each feature and all feature related actions, reducers, components and pages are put under the folder. If you are also comfortable with this pattern, you may find Rekit very useful because it helps you be focused on your application logic instead of technical details.
Firebase v3.0 and React Native make a great pair. react-native-firestack is a thin layer between the native JS Firebase libraries that adds support to the rest of the Google stack - including authentication, real-time database, remote config, storage, and real time events.