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

Java 75,354 25,589 Updated Nov 3, 2025

Google core libraries for Java

Java 51,233 11,081 Updated Nov 2, 2025

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

Java 48,426 7,610 Updated Oct 31, 2025

Netty project - an event-driven asynchronous network application framework

Java 34,559 16,214 Updated Nov 3, 2025

Apache Flink

Java 25,431 13,748 Updated Nov 3, 2025

a fast, scalable, multi-language and extensible build system

Java 24,693 4,329 Updated Nov 3, 2025

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 24,426 4,713 Updated Oct 17, 2023

IntelliJ IDEA & IntelliJ Platform

Java 19,066 5,580 Updated Nov 3, 2025

Modern Java - A Guide to Java 8

Java 16,784 4,030 Updated Aug 11, 2023

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

Java 14,694 3,519 Updated Nov 3, 2025

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Java 14,663 630 Updated Oct 31, 2025

Vert.x is a tool-kit for building reactive applications on the JVM

Java 14,595 2,104 Updated Nov 3, 2025

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

Java 11,576 2,090 Updated Nov 1, 2025

jsoup: the Java HTML parser, built for HTML editing, cleaning, scraping, and XSS safety.

Java 11,273 2,265 Updated Oct 28, 2025

A collection of source code generators for Java.

Java 10,525 1,209 Updated Oct 28, 2025

Flyway by Redgate • Database Migrations Made Easy.

Java 9,229 1,575 Updated Oct 23, 2025

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

Java 8,561 3,436 Updated Nov 1, 2025

A programmer-oriented testing framework for Java — ⚠️ maintenance mode

Java 8,528 3,288 Updated Jun 24, 2025

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

Java 7,854 1,801 Updated Nov 3, 2025

Free and open log management

Java 7,854 1,096 Updated Nov 3, 2025

A fast dependency injector for Android and Java.

Java 7,304 3,092 Updated Aug 26, 2021

Catch common Java mistakes as compile-time errors

Java 7,081 772 Updated Oct 31, 2025

jOOQ is the best way to write SQL in Java

Java 6,565 1,221 Updated Nov 3, 2025

Gephi - The Open Graph Viz Platform

Java 6,258 1,592 Updated Nov 3, 2025

A cross-language remote procedure call(RPC) framework for rapid development of high performance distributed services.

Java 5,899 1,763 Updated Sep 16, 2025

Simple OAuth library for Java

Java 5,468 1,663 Updated Feb 1, 2025

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 5,023 879 Updated Jun 4, 2024

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 4,896 874 Updated Nov 3, 2025

A reference implementation of a JSON package in Java.

Java 4,675 2,590 Updated Oct 31, 2025

Fibers, Channels and Actors for the JVM

Java 4,573 569 Updated Jan 21, 2024
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