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RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
Open Source, Distributed, RESTful Search Engine
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
Google Core Libraries for Java
Bind Android views and callbacks to fields and methods.
A powerful Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, dragging and animations.
An image loading and caching library for Android focused on smooth scrolling
Powerful and flexible library for loading, caching and displaying images on Android.
A memory leak detection library for Android and Java.