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53 stars written in Java
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Spring Framework

Java 59,853 38,859 Updated Apr 16, 2026

光 HikariCP・A solid, high-performance, JDBC connection pool at last.

Java 21,097 3,013 Updated Nov 4, 2025

High Performance Inter-Thread Messaging Library

Java 18,299 3,963 Updated Apr 2, 2025

Zipkin is a distributed tracing system

Java 17,431 3,104 Updated Apr 8, 2026

A standalone Java Decompiler GUI

Java 15,062 2,476 Updated Jul 8, 2024

Suite of tools for deploying and training deep learning models using the JVM. Highlights include model import for keras, tensorflow, and onnx/pytorch, a modular and tiny c++ library for running mat…

Java 14,225 3,841 Updated Apr 2, 2026

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

Java 9,710 1,263 Updated Apr 16, 2026

Distributed and fault-tolerant realtime computation: stream processing, continuous computation, distributed RPC, and more

Java 8,787 1,649 Updated Aug 16, 2017

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

Java 8,580 1,025 Updated Apr 16, 2026

Java interface to OpenCV, FFmpeg, and more

Java 8,306 1,616 Updated Feb 26, 2026

GoCD - Continuous Delivery server main repository

Java 7,389 979 Updated Apr 16, 2026

Alluxio, data orchestration for analytics and machine learning in the cloud

Java 7,184 2,943 Updated Apr 29, 2025

Apache Storm

Java 6,682 4,046 Updated Apr 16, 2026

Reactive Streams Specification for the JVM

Java 4,873 532 Updated Mar 13, 2024

The missing bridge between Java and native C++

Java 4,685 596 Updated Feb 26, 2026

The official AWS SDK for Java 1.x (In Maintenance Mode, End-of-Life on 12/31/2025). The AWS SDK for Java 2.x is available here: https://github.com/aws/aws-sdk-java-v2/

Java 4,198 2,802 Updated Apr 6, 2026

High performance non-blocking webserver

Java 3,748 1,052 Updated Mar 24, 2026

Apache Heron (Incubating) is a realtime, distributed, fault-tolerant stream processing engine from Twitter

Java 3,656 583 Updated Mar 1, 2023

A high performance replicated log service. (The development is moved to Apache Incubator)

Java 2,209 284 Updated Feb 25, 2020

RxJava architecture library for Android

Java 2,048 225 Updated Jun 23, 2018

The ToroDB solution to provide better analytics on top of MongoDB and make it easier to migrate from MongoDB to SQL

Java 1,756 118 Updated Oct 25, 2018

jmxtrans

Java 1,703 499 Updated Sep 5, 2022

Workload Automation System

Java 1,335 231 Updated Apr 16, 2026

Jansi is a small java library that allows you to use ANSI escape sequences to format your console output which works even on windows.

Java 1,192 153 Updated Mar 27, 2026

Scheduler (HTTP API and webapp) for running Mesos tasks—long running processes, one-off tasks, and scheduled jobs. #hubspot-open-source

Java 826 187 Updated Jun 2, 2023

Netflix's distributed Data Pipeline

Java 797 172 Updated Apr 10, 2023

Low-overhead, non-blocking I/O, external Process implementation for Java

Java 742 83 Updated Dec 14, 2024

Extensible Scheduler for Mesos Frameworks

Java 700 113 Updated Mar 31, 2023

Logging framework for fast asynchronous logging

Java 567 114 Updated Dec 10, 2024

Timeline visualization application

Java 459 70 Updated Jul 30, 2010
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