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

RxJava bindings for Android

A fast dependency injector for Android and Java.

Name UI states, navigate between them, remember where you've been.

A system for distributing and managing secrets

A simple library that makes it easy to pair thin views with dedicated controllers, isolated from most of the vagaries of the Activity life cycle.

A fast Gherkin parser in Ragel (The parser behind Cucumber)