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

Luban(鲁班)—Image compression with efficiency very close to WeChat Moments/可能是最接近微信朋友圈的图片压缩算法

Apache Druid: a high performance real-time analytics database.

A powerful Android Dynamic Component Framework.

Apache Kylin

A data collection library for click and exposure event with the UI.