RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

ZXing ("Zebra Crossing") barcode scanning library for Java, Android

Telegram for Android source

A Java serialization/deserialization library to convert Java Objects into JSON and back

✔️ Simple, pretty and powerful logger for android

Tiny, easily embeddable HTTP server in Java.

Generate Java types from JSON or JSON Schema and annotate those types for data-binding with Jackson, Gson, etc

Android Asynchronous Networking and Image Loading

Barcode scanner library for Android, based on the ZXing decoder

Database for Android and JVM - first and fast, lightweight on-device vector database

A Gradle plugin to report the number of method references in your APK on every build.

Deprecated: The Mobile Vision API is now a part of ML Kit: Check out this repo:

A DLNA, UPnP and HTTP(S) Media Server.

Java Deferred/Promise library similar to JQuery.

A small Android library to get the market name of an Android device.

SMS gateway for Android powered phones

Android's WebView and WebChromeClient class extensions that enable fully working HTML5 video support

Library for easily sending SMS and MMS for Android devices

Android Web Server (NanoHttpd)

📞 IMEI (USSD) Library in Android Devices by @romellfudi

Android >=2.3 Class 0 SMS Proof of concept

A Javascript style Promise library for Android JVM