... I send out a list of most interesting libraries and apps in the "Android" section to about 1100 subscribers.
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NeuroLab Android https://github.com/fossasia/neurolab-android/raw/apk/neurolab-dev-debug.apk
Flutter makes it easy and fast to build beautiful mobile apps.
Sceneform SDK for Android
DuckDuckGo Android App
Haven is for people who need a way to protect their personal spaces and possessions without compromising their own privacy, through an Android app and on-device sensors
Multiple samples showing the best practices in location APIs on Android.
Open source fork of the Google Authenticator Android app
Android application following best practices: Kotlin, coroutines, Clean Architecture, feature modules, tests, MVVM, static analysis...