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

Netty project - an event-driven asynchronous network application framework

Telegram for Android source

Zipkin is a distributed tracing system

Powerful and flexible library for loading, caching and displaying images on Android.

The official home of the Presto distributed SQL query engine for big data

Vert.x is a tool-kit for building reactive applications on the JVM

Style and Grammar Checker for 25+ Languages

Suite of tools for deploying and training deep learning models using the JVM. Highlights include model import for keras, tensorflow, and onnx/pytorch, a modular and tiny c++ library for running mat…

The Most Powerful Swipe Layout!

An Android library that allows you to easily create applications with slide-in menus. You may use it in your Android apps provided that you cite this project and include the license in your app. Th…

A barebones WebSocket client and server implementation written in 100% Java.

Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock.

PocketHub Android App

DEPRECATED

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

A damn simple library for building production-ready RESTful web services.

A Material Design ViewPager easy to use library

Tools for keeping your cloud operating in top form. Chaos Monkey is a resiliency tool that helps applications tolerate random instance failures.

📈 Capturing JVM- and application-level metrics. So you know what's going on.

A podcast manager for Android

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

OWASP dependency-check is a software composition analysis utility that detects publicly disclosed vulnerabilities in application dependencies.

[DEPRECATED] Action bar implementation which uses the native action bar on Android 4.0+ and a custom implementation on pre-4.0 through a single API and theme.

Android Asynchronous Networking and Image Loading

The Physical Web: walk up and use anything

Java implementation of a Disk-based LRU cache which specifically targets Android compatibility.

A Spring Framework based, pragmatic style JavaEE application reference architecture.

Distributed Graph Database

Joda-Time is the widely used replacement for the Java date and time classes prior to Java SE 8.