Free and Open Source, Distributed, RESTful Search Engine

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

Apache Flink

Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex di…

GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

The official home of the Presto distributed SQL query engine for big data

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…

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

APM, (Application Performance Management) tool for large-scale distributed systems.

The world's fastest open query engine for sub-second analytics both on and off the data lakehouse. With the flexibility to support nearly any scenario, StarRocks provides best-in-class performance …

Open source transactional distributed database. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure without compromising performance.

Distributed and fault-tolerant realtime computation: stream processing, continuous computation, distributed RPC, and more

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

A damn simple library for building production-ready RESTful web services.

📈 Capturing JVM- and application-level metrics. So you know what's going on.

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

jOOQ is the best way to write SQL in Java

Statistical Machine Intelligence & Learning Engine

configuration library for JVM languages using HOCON files

Open-Source Subscription Billing & Payments Platform

Distributed Graph Database

Apache Calcite

Fibers, Channels and Actors for the JVM

Micro second messaging that stores everything to disk

Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with…

Open, Multi-modal Catalog for Data & AI

This is an adaptation of the Ninety-Nine Prolog Problems written by Werner Hett.

Actor Messaging platform