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

Java 75,685 25,786 Updated Dec 21, 2025

Google core libraries for Java

Java 51,352 11,116 Updated Dec 18, 2025

Mirror of Apache Kafka

Java 31,563 14,847 Updated Dec 20, 2025

Apache Flink

Java 25,621 13,808 Updated Dec 19, 2025

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

Java 24,914 4,371 Updated Dec 20, 2025

Zipkin is a distributed tracing system

Java 17,370 3,105 Updated Aug 15, 2025

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

Java 16,598 5,509 Updated Dec 20, 2025

Apache Pulsar - distributed pub-sub messaging system

Java 15,013 3,698 Updated Dec 19, 2025

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

Java 13,959 2,434 Updated Dec 17, 2025

Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 11 and above, brought to you by Google.

Java 12,712 1,692 Updated Dec 1, 2025

Apache ZooKeeper

Java 12,691 7,326 Updated Dec 19, 2025

The Java gRPC implementation. HTTP/2 based RPC

Java 11,932 3,951 Updated Dec 17, 2025

Spinnaker is an open source, multi-cloud continuous delivery platform for releasing software changes with high velocity and confidence.

Java 9,654 1,240 Updated Dec 20, 2025

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

Java 8,803 1,657 Updated Aug 16, 2017

Apache Beam is a unified programming model for Batch and Streaming data processing.

Java 8,411 4,463 Updated Dec 20, 2025

Tools for keeping your cloud operating in top form. Chaos Monkey is a resiliency tool that helps applications tolerate random instance failures.

Java 7,983 1,128 Updated Dec 18, 2018

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

Java 7,855 1,800 Updated Dec 19, 2025

Apache Storm

Java 6,668 4,054 Updated Dec 19, 2025

Code samples for YouTube APIs, including the YouTube Data API, YouTube Analytics API, and YouTube Live Streaming API. The repo contains language-specific directories that contain the samples.

Java 5,894 3,046 Updated Jun 9, 2024

Apache NiFi

Java 5,879 2,911 Updated Dec 20, 2025

JanusGraph: an open-source, distributed graph database

Java 5,683 1,209 Updated Nov 21, 2025

Yahoo! Cloud Serving Benchmark

Java 5,171 2,315 Updated Nov 10, 2025

Azkaban workflow manager.

Java 4,520 1,583 Updated Jul 3, 2024

Maxwell's daemon, a mysql-to-json kafka producer

Java 4,218 1,029 Updated Dec 10, 2025

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/

Java 4,188 2,813 Updated Dec 19, 2025

Apache Heron (Incubating) is a realtime, distributed, fault-tolerant stream processing engine from Twitter

Java 3,679 588 Updated Mar 1, 2023

Generates a unified GraphQL schema from gRPC microservices and other Protobuf sources

Java 3,670 136 Updated Jun 13, 2023

Apache Avro is a data serialization system.

Java 3,196 1,720 Updated Dec 17, 2025

Blue Ocean is a reboot of the Jenkins CI/CD User Experience

Java 2,892 539 Updated Dec 18, 2025

This is no longer the active Jersey repository. Please see the README.md

Java 2,851 2,315 Updated Jul 20, 2021
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