Design patterns implemented in Java
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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
Orchestrate everything, everywhere. The open-source control plane for workflows across data, infrastructure, business processes and AI agents. Declarative YAML, event-driven, any language, Git-versioned, scalable to millions of executions.
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.
The ZAP by Checkmarx Core project
Quarkus: Supersonic Subatomic Java.
A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)
Open source alternative to Auth0 / Firebase Auth / AWS Cognito
No clever tagline needed.
Change data capture for a variety of databases. Please log issues at https://github.com/debezium/dbz/issues.
Apache ZooKeeper
Open-Source Web UI for Apache Kafka Management
Java JWT: JSON Web Token for Java and 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.
Apache Iceberg
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.
A tool for mocking HTTP services
Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.
Apache KIE (Knowledge Is Everything) is the home of Drools, OptaPlanner, jBPM, and Kogito.
Apache NiFi