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

Jenkins automation server

光 HikariCP・A solid, high-performance, JDBC connection pool at last.

A high performance caching library for Java

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…

PocketHub Android App

A programmer-oriented testing framework for Java — ⚠️ maintenance mode

Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.

Statistical Machine Intelligence & Learning Engine

The official AWS SDK for Java 1.x (In Maintenance Mode, End-of-Life on 12/31/2025). The AWS SDK for Java 2.x is available here: https://github.com/aws/aws-sdk-java-v2/

An uber-fast parallelized Java classpath scanner and module scanner.

Replicate your Key Value Store across your network, with consistency, persistance and performance.

A High Dynamic Range (HDR) Histogram

fastutil extends the Java™ Collections Framework by providing type-specific maps, sets, lists and queues.

The Jdbi library provides convenient, idiomatic access to relational databases in Java and other JVM technologies such as Kotlin, Clojure or Scala.

Bind a java thread to a given core

State of the art mutation testing system for the JVM

Lightweight threads for Java, with message passing, nio, http and scheduling support.

BitTorrent Java library with tracker and download client

A sampling JVM profiler without the safepoint sample bias

Simple Java image-scaling library implementing Chris Campbell's incremental scaling algorithm as well as Java2D's "best-practices" image-scaling techniques.

java deep learning algorithms and deep neural networks with gpu acceleration

The JGroups project

Java Statistical Analysis Tool, a Java library for Machine Learning

Low-overhead, non-blocking I/O, external Process implementation for Java

Simple, lightweight and fast event bus tailored for Android

High-performance JSON parser