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

Java 76,611 25,873 Updated Apr 29, 2026

RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

Java 48,288 7,589 Updated Apr 29, 2026

Apache Kafka - A distributed event streaming platform

Java 32,485 15,152 Updated Apr 29, 2026

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

Java 21,570 1,790 Updated Apr 29, 2026

A high performance caching library for Java

Java 17,626 1,685 Updated Apr 29, 2026

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

Java 11,820 2,137 Updated Apr 24, 2026

A collection of source code generators for Java.

Java 10,553 1,212 Updated Apr 27, 2026

Java Native Access

Java 8,910 1,681 Updated Apr 13, 2026

A damn simple library for building production-ready RESTful web services.

Java 8,584 3,412 Updated Apr 29, 2026

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

Java 8,556 4,543 Updated Apr 29, 2026

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

Java 7,849 1,793 Updated Apr 28, 2026

Catch common Java mistakes as compile-time errors

Java 7,165 789 Updated Apr 28, 2026

GraphQL Java implementation

Java 6,238 1,145 Updated Apr 27, 2026

Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps …

Java 5,364 458 Updated Oct 30, 2025

Distributed Graph Database

Java 5,234 998 Updated Oct 19, 2022

OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID…

Java 4,950 872 Updated Apr 28, 2026

OpenGrok is a fast and usable source code search and cross reference engine, written in Java

Java 4,808 807 Updated Apr 27, 2026
Java 3,823 587 Updated Apr 24, 2026

High performance non-blocking webserver

Java 3,748 1,053 Updated Mar 24, 2026

A quickstart generator for Spring projects

Java 3,668 1,793 Updated Apr 17, 2026

Apache Lucene open-source search software

Java 3,412 1,341 Updated Apr 29, 2026

Compiles Java bytecode to JavaScript, WebAssembly and C

Java 3,037 317 Updated Apr 28, 2026

Copybara: A tool for transforming and moving code between repositories.

Java 2,698 304 Updated Apr 28, 2026

Confluent Schema Registry for Kafka

Java 2,427 1,156 Updated Apr 29, 2026

Java distributed tracing implementation compatible with Zipkin backend services.

Java 2,404 714 Updated Mar 25, 2026

A High Dynamic Range (HDR) Histogram

Java 2,299 269 Updated Jun 27, 2024

Stream summarizer and cardinality estimator.

Java 2,266 556 Updated Nov 28, 2019

The JTS Topology Suite is a Java library for creating and manipulating vector geometry.

Java 2,208 465 Updated Mar 6, 2026

Maven plugin for running and creating Docker images

Java 1,928 655 Updated Apr 1, 2026

Ultra-fast SQL-like queries on Java collections

Java 1,770 254 Updated Dec 27, 2023
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