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

Desktop/Android/HTML5/iOS Java game development framework

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…

A list of useful Java frameworks, libraries, software and hello worlds examples

Awaitility is a small Java DSL for synchronizing asynchronous operations

GS Collections has been migrated to the Eclipse Foundation, re-branded as Eclipse Collections. https://www.eclipse.org/collections/

Digital Signature Service : creation, extension and validation of advanced electronic signatures

Like GWT-RPC but with REST/JSON coolness

Cassandra 3 GUI client

Kafka client in old plain java