Open source version of Google Authenticator (except the Android app)
Open source fork of the Google Authenticator Android app
Google Cloud Client Library for Java
A collection of quickstart samples demonstrating the Google APIs for Android and iOS
React Native wrapper for the Google Cast SDK
A flexible React-native module for Google-Fit
iOS/Android Google Places Widgets (Autocomplete Modals) and API Services for React Native Apps
Google Pay API sample application for Android
Android example app demonstrating integration with Google Photos, using the Drive REST API.
A React Native bridge module for interacting with Google Fit
Got any useful tips about google/guava?
... I send out a list of most interesting libraries and apps in the "Java" section to about 1100 subscribers.
Do you want it too?