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

Java 76,531 25,844 Updated Apr 16, 2026

Free universal database tool and SQL client

Java 49,597 4,116 Updated Apr 16, 2026

APM, Application Performance Monitoring System

Java 24,779 6,644 Updated Apr 16, 2026

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…

Java 24,459 4,698 Updated Dec 17, 2025

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

Java 16,864 1,561 Updated Apr 16, 2026

Apache Pulsar - distributed pub-sub messaging system

Java 15,200 3,716 Updated Apr 16, 2026

Logstash - transport and process your logs, events, or other data

Java 14,836 3,500 Updated Apr 15, 2026

🏗 Build container images for your Java applications.

Java 14,370 1,468 Updated Apr 7, 2026

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

Java 13,822 3,759 Updated Apr 15, 2026

Apache Iceberg

Java 8,740 3,164 Updated Apr 16, 2026

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

Java 7,982 1,122 Updated Dec 18, 2018

Alluxio, data orchestration for analytics and machine learning in the cloud

Java 7,184 2,942 Updated Apr 29, 2025

Use SQL to query Elasticsearch

Java 7,018 1,532 Updated Feb 21, 2026

AI + Data, online. https://vespa.ai

Java 6,874 707 Updated Apr 16, 2026

Apache Ignite

Java 5,064 1,933 Updated Apr 15, 2026

A scalable, distributed Time Series Database.

Java 5,063 1,239 Updated Dec 12, 2024

CrateDB is a distributed and scalable SQL database for storing and analyzing massive amounts of data in near real-time, even with complex queries. It is PostgreSQL-compatible, and based on Lucene.

Java 4,385 594 Updated Apr 15, 2026

Apache Curator

Java 3,172 1,250 Updated Mar 16, 2026

Apache CloudStack is an opensource Infrastructure as a Service (IaaS) cloud computing platform

Java 2,865 1,300 Updated Apr 16, 2026

Xinfra Monitor monitors the availability of Kafka clusters by producing synthetic workloads using end-to-end pipelines to obtain derived vital statistics - E2E latency, service produce/consume avai…

Java 2,059 447 Updated Mar 9, 2025

Apache Drill is a distributed MPP query layer for self describing data

Java 2,014 984 Updated Mar 30, 2026

🐘 Elasticsearch real-time search and analytics natively integrated with Hadoop

Java 2,002 992 Updated Apr 10, 2026

Ultimate Component Suite for Jakarta Faces

Java 1,900 785 Updated Apr 15, 2026

Distributed object store

Java 1,784 288 Updated Apr 15, 2026

jmxtrans

Java 1,703 499 Updated Sep 5, 2022

A Java wrapper to run Spring, Spring Boot, Jersey, and other apps inside AWS Lambda.

Java 1,556 570 Updated Mar 20, 2026

Plugin to integrate Learning to Rank (aka machine learning for better relevance) with Elasticsearch

Java 1,525 374 Updated Feb 19, 2026

Dremio - the missing link in modern data

Java 1,482 462 Updated Sep 26, 2025

Machine Learning Platform and Recommendation Engine built on Kubernetes

Java 1,479 299 Updated Apr 12, 2020

Elasticsearch File System Crawler (FS Crawler)

Java 1,441 305 Updated Apr 15, 2026
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