Netty project - an event-driven asynchronous network application framework

Open Source Identity and Access Management For Modern Applications and Services

Zipkin is a distributed tracing system

A high performance caching library for Java

Resilience4j is a fault tolerance library designed for Java8 and functional programming

Java DSL for easy testing of REST services

1️⃣🐝🏎️ The One Billion Row Challenge -- A fun exploration of how quickly 1B rows from a text file can be aggregated with Java

Generate Java types from JSON or JSON Schema and annotate those types for data-binding with Jackson, Gson, etc

Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps …

Yahoo! Cloud Serving Benchmark

MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.

A reference implementation of a JSON package in Java.

High performance non-blocking webserver

High Performance data structures and utility methods for Java

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

Java rate limiting library based on token-bucket algorithm.

Java (and original) version of Hamcrest

The modular web framework for Java and Kotlin

Social Style Date and Time Formatting for Java

Java Indexed Record Chronicle

Nessie: Transactional Catalog for Data Lakes with Git-like semantics

Distributed Stream and Batch Processing

ActiveJ is an alternative Java platform built from the ground up. ActiveJ redefines core, web and high-load programming in Java, providing simplicity, maximum performance and scalability

A software library of stochastic streaming algorithms, a.k.a. sketches.

JavaLite is a cohesive collection of frameworks designed from ground up to add pleasure back to your daily life

An Intuitive Event-Driven Reactive Programming Library for Java

tinylog is a lightweight logging framework for Java, Kotlin, Scala, and Android

Simple project environment for creating custom Keycloak extensions

A modern and intuitive command line client for Kafka Connect