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

Java 75,673 25,770 Updated Dec 19, 2025

Ghidra is a software reverse engineering (SRE) framework

Java 62,871 6,986 Updated Dec 17, 2025

Open Source Identity and Access Management For Modern Applications and Services

Java 31,767 7,904 Updated Dec 19, 2025

Mirror of Apache Kafka

Java 31,557 14,843 Updated Dec 19, 2025

Apache Flink

Java 25,615 13,805 Updated Dec 19, 2025

Jenkins automation server

Java 24,794 9,263 Updated Dec 19, 2025

A collection of algorithms and data structures

Java 18,398 4,523 Updated Dec 30, 2024

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

Java 16,478 1,518 Updated Dec 19, 2025

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

Java 14,750 3,519 Updated Dec 19, 2025

Arduino IDE 1.x

Java 14,498 7,007 Updated Oct 11, 2025

🔎 Open source distributed and RESTful search engine.

Java 12,064 2,352 Updated Dec 19, 2025

Apache Cassandra®

Java 9,541 3,810 Updated Dec 18, 2025

MCP Server for Ghidra

Java 6,741 532 Updated Jun 23, 2025

Apache Pinot - A realtime distributed OLAP datastore

Java 5,991 1,434 Updated Dec 19, 2025

Apache NiFi

Java 5,879 2,911 Updated Dec 18, 2025

Apache HBase

Java 5,524 3,385 Updated Dec 19, 2025

A scalable, distributed Time Series Database.

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

The Apache Tika toolkit detects and extracts metadata and text from over a thousand different file types (such as PPT, XLS, and PDF).

Java 3,473 899 Updated Dec 18, 2025

Apache Lucene open-source search software

Java 3,282 1,260 Updated Dec 18, 2025

Apache Ambari simplifies provisioning, managing, and monitoring of Apache Hadoop clusters.

Java 2,277 1,744 Updated Dec 13, 2025

A cluster computing framework for processing large-scale geospatial data

Java 2,263 743 Updated Dec 18, 2025

Sakai is a freely available, feature-rich technology solution for learning, teaching, research and collaboration. Sakai is an open source software suite developed by a diverse and global adopter co…

Java 1,193 997 Updated Dec 18, 2025