The Kotlin Programming Language.

Square’s meticulous HTTP client for the JVM, Android, and GraalVM.

A collection of samples to discuss and showcase different architectural tools and patterns for Android apps.

A powerful image downloading and caching library for Android

Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)

RxJava binding APIs for Android's UI widgets.

Kotlin SQL Framework

GPP is Android's unofficial release automation Gradle Plugin. It can do anything from building, uploading, and then promoting your App Bundle or APK to publishing app listings and other metadata.

WordPress for Android

[Android] Round Corner Progress Bar Library for Android

An Android ExoPlayer wrapper to simplify Audio and Video implementations

Small Reddit Android client developed with Kotlin

Kotlin extensions to simplify Realm API.

Rx based RecyclerView Adapter

Keddit: A Reddit Android client using Kotlin (Retrofit, RxJava, RxAndroid...)