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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

The automation tower defense RTS

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

Apache Flink

Jenkins automation server

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

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

🍃 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!

Universal File Online Preview Project based on Spring-Boot

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...

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

🔎 Open source distributed and RESTful search engine.