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

Java 76,387 25,834 Updated Mar 29, 2026

Ghidra is a software reverse engineering (SRE) framework

Java 66,325 7,307 Updated Mar 27, 2026

Open Source Identity and Access Management For Modern Applications and Services

Java 33,625 8,186 Updated Mar 29, 2026

Apache Kafka - A distributed event streaming platform

Java 32,226 15,070 Updated Mar 29, 2026

Apache Flink

Java 25,906 13,906 Updated Mar 29, 2026

Jenkins automation server

Java 25,142 9,442 Updated Mar 29, 2026

A collection of algorithms and data structures

Java 18,544 4,525 Updated Mar 25, 2026

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

Java 16,798 1,555 Updated Mar 29, 2026

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Java 14,988 657 Updated Mar 26, 2026

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

Java 14,815 3,502 Updated Mar 27, 2026

Arduino IDE 1.x

Java 14,556 6,988 Updated Oct 11, 2025

🔎 Open source distributed and RESTful search engine.

Java 12,661 2,487 Updated Mar 29, 2026

Apache Cassandra®

Java 9,677 3,854 Updated Mar 27, 2026

MCP Server for Ghidra

Java 8,076 748 Updated Jun 23, 2025

Apache Pinot - A realtime distributed OLAP datastore

Java 6,051 1,458 Updated Mar 29, 2026

Apache NiFi

Java 6,029 2,937 Updated Mar 29, 2026

Apache HBase

Java 5,580 3,395 Updated Mar 29, 2026

A scalable, distributed Time Series Database.

Java 5,064 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 3,660 917 Updated Mar 29, 2026

Apache Lucene open-source search software

Java 3,392 1,321 Updated Mar 27, 2026

A cluster computing framework for processing large-scale geospatial data

Java 2,316 753 Updated Mar 29, 2026

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

Java 2,297 1,742 Updated Feb 20, 2026

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 1,208 1,011 Updated Mar 29, 2026