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47 stars written in Java
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Free and Open Source, Distributed, RESTful Search Engine

Java 76,393 25,832 Updated Apr 1, 2026

Free universal database tool and SQL client

Java 49,353 4,095 Updated Apr 1, 2026

Open Source Identity and Access Management For Modern Applications and Services

Java 33,674 8,202 Updated Apr 1, 2026

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

Java 26,643 2,538 Updated Apr 1, 2026

a fast, scalable, multi-language and extensible build system

Java 25,283 4,437 Updated Apr 1, 2026

APM, Application Performance Monitoring System

Java 24,764 6,639 Updated Apr 1, 2026

Zipkin is a distributed tracing system

Java 17,420 3,101 Updated Mar 25, 2026

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

Java 16,673 5,533 Updated Apr 1, 2026

Apache Pulsar - distributed pub-sub messaging system

Java 15,183 3,714 Updated Apr 1, 2026

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Java 14,993 657 Updated Apr 1, 2026

The ZAP by Checkmarx Core project

Java 14,940 2,529 Updated Apr 1, 2026

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

Java 14,002 2,435 Updated Apr 1, 2026

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

Java 13,818 3,759 Updated Apr 1, 2026

Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)

Java 12,682 3,552 Updated Apr 1, 2026

🔎 Open source distributed and RESTful search engine.

Java 12,677 2,494 Updated Apr 1, 2026

Open-Source Web UI for Apache Kafka Management

Java 11,994 1,380 Updated Jul 26, 2024

OpenRefine is a free, open source power tool for working with messy data and improving it

Java 11,792 2,133 Updated Mar 28, 2026

The Metadata Platform for your Data and AI Stack

Java 11,748 3,416 Updated Apr 1, 2026

Apache Cassandra®

Java 9,680 3,853 Updated Apr 1, 2026

Flyway by Redgate • Database Migrations Made Easy.

Java 9,642 1,606 Updated Mar 31, 2026

Test Automation Made Simple

Java 8,824 2,024 Updated Apr 1, 2026

Free and open log management

Java 7,992 1,100 Updated Apr 1, 2026

GoCD - Continuous Delivery server main repository

Java 7,386 978 Updated Mar 31, 2026

Kafka Web UI

Java 6,125 893 Updated Mar 26, 2026

Apache Kafka® running on Kubernetes

Java 5,755 1,472 Updated Mar 31, 2026

A comprehensive Domain-Driven Design example with problem space strategic analysis and various tactical patterns.

Java 5,717 815 Updated Jul 7, 2023

Main Liquibase Source

Java 5,467 1,941 Updated Apr 1, 2026

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…

Java 5,324 761 Updated Apr 1, 2026

MockServer enables easy mocking of any system you integrate with via HTTP or HTTPS with clients written in Java, JavaScript and Ruby. MockServer also includes a proxy that introspects all proxied t…

Java 4,859 1,099 Updated Dec 19, 2025

Ribbon is a Inter Process Communication (remote procedure calls) library with built in software load balancers. The primary usage model involves REST calls with various serialization scheme support.

Java 4,617 1,236 Updated Dec 17, 2025
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