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A powerful flow control component enabling reliability, resilience and monitoring for microservices. (面向云原生微服务的高可用流控防护组件)

Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.

Open-source IoT Platform - Device management, data collection, processing and visualization.

This project is deprecated and stale. The latest ExoPlayer code is available in https://github.com/androidx/media

Video players (IJKplayer, ExoPlayer, MediaPlayer), HTTPS, 16k page size, danmaku (bullet chat) support, external subtitles, support for filters, watermarks, and GIF screenshots, pre-roll and mid-roll ads, multiple simultaneous playback, basic seeking/dragging, volume and brightness adjustment, play-while-cache support

IntelliJ IDEA & IntelliJ Platform

CAT 作为服务端项目基础组件，提供了 Java, C/C++, Node.js, Python, Go 等多语言客户端，已经在美团点评的基础架构中间件框架（MVC框架，RPC框架，数据库框架，缓存框架等，消息队列，配置系统等）深度集成，为美团点评各业务线提供系统丰富的性能指标、健康状况、实时告警等。

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

Graphs for Everyone

Cryptomator for Windows, macOS, and Linux: Secure client-side encryption for your cloud storage, ensuring privacy and control over your data.

The ZAP by Checkmarx Core project

Apache Hadoop

Apache Pulsar - distributed pub-sub messaging system

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

The Unified and Autonomous Development Platform

A standalone Java Decompiler GUI

Style and Grammar Checker for 25+ Languages

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

Universal File Online Preview Project based on Spring-Boot

Arduino IDE 1.x

Apache DolphinScheduler is the modern data orchestration platform. Agile to create high performance workflow with low-code

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 math code and a java based math library on top of the core c++ library. Also includes samediff: a pytorch/tensorflow like library for running deep learn...

Apache Druid: a high performance real-time analytics database.

APM, (Application Performance Management) tool for large-scale distributed systems.

🔎 Open source distributed and RESTful search engine.

MeterSphere 是新一代的开源持续测试工具，内置 AI 助手，让软件测试工作更简单、更高效，不再成为持续交付的瓶颈。

Tools to work with android .dex and java .class files

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.

A free, secure and open source app for Android to manage your 2-step verification tokens.

Apache ZooKeeper