Design patterns implemented in Java

All Algorithms implemented in Java

Termux - a terminal emulator application for Android OS extendible by variety of packages.

微信开发 Java SDK ，支持包括微信支付，开放平台，小程序，企业微信，视频号，公众号等的后端开发

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Jenkins automation server

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

:zap: Universal Workflow Orchestration Platform — Code in any language, run anywhere. 900+ plugins for data, infrastructure, and AI automation.

A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)

Quarkus: Supersonic Subatomic Java.

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

The ZAP by Checkmarx Core project

Apache ZooKeeper

Change data capture for a variety of databases. Please log issues at https://issues.redhat.com/browse/DBZ.

The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies

Open-Source Web UI for Apache Kafka Management

No clever tagline needed.

Java JWT: JSON Web Token for Java and Android

Views and Drawable for displaying animated GIFs on Android

Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.