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

Java 76,387 25,835 Updated Mar 29, 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 24,463 4,703 Updated Dec 17, 2025

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

Java 16,798 1,556 Updated Mar 29, 2026

Arduino IDE 1.x

Java 14,553 6,988 Updated Oct 11, 2025

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

Java 11,790 2,131 Updated Mar 28, 2026

The Clojure programming language

Java 10,833 1,456 Updated Jan 16, 2026

Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly co…

Java 8,906 4,083 Updated Mar 29, 2026

Pentaho Data Integration ( ETL ) a.k.a Kettle

Java 8,322 3,583 Updated Mar 29, 2026

Android application powering the mirror in my house

Java 7,830 655 Updated May 28, 2023

jOOQ is the best way to write SQL in Java

Java 6,688 1,226 Updated Mar 26, 2026

Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.

Java 6,383 1,897 Updated Mar 29, 2026

Distributed Graph Database

Java 5,236 999 Updated Oct 19, 2022

MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.

Java 5,036 882 Updated Jun 4, 2024

RStudio is an integrated development environment (IDE) for R

Java 4,978 1,166 Updated Mar 28, 2026

LIBSVM -- A Library for Support Vector Machines

Java 4,697 1,639 Updated Dec 29, 2025

Fibers, Channels and Actors for the JVM

Java 4,564 567 Updated Jan 21, 2024

Java bytecode engineering toolkit

Java 4,230 720 Updated Oct 3, 2024

Backport of Java 8's lambda expressions to Java 7, 6 and 5

Java 3,527 226 Updated Sep 26, 2023

Soot - A Java optimization framework

Java 3,077 719 Updated Mar 3, 2026

ssh, scp and sftp for java

Java 2,638 614 Updated Feb 17, 2026

A High Dynamic Range (HDR) Histogram

Java 2,351 268 Updated Jun 27, 2024

Please visit https://github.com/h2oai/h2o-3 for latest H2O

Java 2,319 553 Updated Oct 24, 2024

Read Eval Print Loop for Java

Java 1,339 189 Updated Aug 4, 2018

Apache Jena, A free and open source Java framework for building Semantic Web and Linked Data applications.

Java 1,305 680 Updated Mar 27, 2026

Anserini is a Lucene toolkit for reproducible information retrieval research

Java 1,108 584 Updated Mar 27, 2026

MALLET is a Java-based package for statistical natural language processing, document classification, clustering, topic modeling, information extraction, and other machine learning applications to t…

Java 1,024 352 Updated Feb 6, 2026

Property-based testing, JUnit-style

Java 977 121 Updated Nov 18, 2024

This project contains the source code of a tool for generating regular expressions for text extraction: 1. automatically, 2. based only on examples of the desired behavior, 3. without any external …

Java 954 140 Updated Aug 2, 2020

An implementation of MobileOrg for the Android platform

Java 846 225 Updated Dec 3, 2018
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