Free and Open Source, Distributed, RESTful Search Engine

Free universal database tool and SQL client

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

The java implementation of Apache Dubbo. An RPC and microservice framework.

Netty project - an event-driven asynchronous network application framework

Open Source Identity and Access Management For Modern Applications and Services

Apache Kafka - A distributed event streaming platform

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Jenkins automation server

Desktop/Android/HTML5/iOS Java game development framework

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

IntelliJ IDEA & IntelliJ Platform

A high performance caching library for Java

QuestDB is a high performance, open-source, time-series database

Quarkus: Supersonic Subatomic Java.

Apache Hadoop

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Zuul is a gateway service that provides dynamic routing, monitoring, resiliency, security, and more.

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

Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.

Apache ZooKeeper

The Clojure programming language

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

Enso Analytics is a self-service data prep and analysis platform designed for data teams.

Tutorials for using RabbitMQ in various ways

A rewrite of Tachiyomi for the Desktop

Apache Storm

Open-Source Subscription Billing & Payments Platform

Allure Report is a flexible, lightweight multi-language test reporting tool. It provides clear graphical reports and allows everyone involved in the development process to extract the maximum of in…

H2 is an embeddable RDBMS written in Java.