The Kotlin Programming Language

Netty project - an event-driven asynchronous network application framework

Open Source, Distributed, RESTful Search Engine

Google Core Libraries for Java 6+

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

Type-safe HTTP client for Android and Java by Square, Inc.

An HTTP+HTTP/2 client for Android and Java applications.

Design patterns implemented in Java

Desktop/Android/HTML5/iOS Java game development framework

Spring Boot

A powerful Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, dragging and animations.

Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex di…

Implementation of ImageView for Android that supports zooming, by various touch gestures.

The Spring Framework

The Physical Web: walk up and use anything

An Android library for managing images and the memory they use.

The flexible, easy to use, all in one drawer library for your Android project.

Official ZXing ("Zebra Crossing") project home

Bind Android views and callbacks to fields and methods.