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#1 PDF Application on GitHub that lets you edit PDFs on any device anywhere

😮 Core Interview Questions & Answers For Experienced Java(Backend) Developers | 互联网 Java 工程师进阶知识完全扫盲：涵盖高并发、分布式、高可用、微服务、海量数据处理等领域知识

Free and Open Source, Distributed, RESTful Search Engine

LeetCode Solutions: A Record of My Problem Solving Journey.( leetcode题解，记录自己的leetcode解题之路。)

Free universal database tool and SQL client

Dex to Java decompiler

Apache Spark - A unified analytics engine for large-scale data processing

Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.

Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas

A browser automation framework and ecosystem.

Conductor is an event driven agentic workflow engine providing durable and highly resilient execution engine for applications and AI Agents

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

The automation tower defense RTS

Jenkins automation server

Apache Flink

Desktop/Android/HTML5/iOS Java game development framework

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 data movement for ELT pipelines and AI agents — from APIs, databases & files to warehouses, lakes, and AI applications. Both self-hosted and Cloud.

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。

Adaptable, fast automation for all

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

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

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

🍃 Organic Maps is a free Android & iOS offline maps app for more than 6M travelers, tourists, hikers, and cyclists. It uses crowd-sourced OpenStreetMap data and is developed with love by the community. No ads, no tracking, no data collection, no crapware. Please donate to support the development!

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

Universal File Online Preview Project based on Spring-Boot

Docker image that provides a Minecraft Server for Java Edition that automatically installs/upgrades versions, modloaders, modpacks and more at startup

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...

🔎 Open source distributed and RESTful search engine.