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Starred repositories

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

Java 75,669 25,771 Updated Dec 19, 2025

Everything you need to know to get the job.

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Free universal database tool and SQL client

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A browser automation framework and ecosystem.

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Open Source Identity and Access Management For Modern Applications and Services

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Learn System Design concepts and prepare for interviews using free resources.

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Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

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Apache Flink

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OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Java 25,445 7,324 Updated Dec 18, 2025

GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀

Java 21,369 1,762 Updated Dec 19, 2025

Zipkin is a distributed tracing system

Java 17,371 3,105 Updated Aug 15, 2025

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

Java 16,594 5,510 Updated Dec 19, 2025

Graphs for Everyone

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Apache Hadoop

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Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Java 14,778 630 Updated Dec 18, 2025

The ZAP by Checkmarx Core project

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Style and Grammar Checker for 25+ Languages

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Change data capture for a variety of databases. Please log issues at https://github.com/debezium/dbz/issues.

Java 12,192 2,805 Updated Dec 18, 2025

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

Java 11,657 2,108 Updated Dec 19, 2025

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

Java 9,654 1,241 Updated Dec 19, 2025

Apache Cassandra®

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A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users.

Java 8,957 2,779 Updated Dec 16, 2025

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

Java 7,982 1,128 Updated Dec 18, 2018

Web-based notebook that enables data-driven, interactive data analytics and collaborative documents with SQL, Scala and more.

Java 6,590 2,833 Updated Dec 9, 2025

⚠️ Processing moved to processing/processing4 ⚠️

Java 6,498 1,478 Updated May 18, 2025

Idiomatic persistence for Java and relational databases

Java 6,371 3,709 Updated Dec 18, 2025

Drools is a rule engine, DMN engine and complex event processing (CEP) engine for Java.

Java 6,190 2,579 Updated Dec 18, 2025
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A machine learning software for extracting information from scholarly documents

Java 4,510 525 Updated Dec 18, 2025

Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with…

Java 3,491 779 Updated Dec 18, 2025
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