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This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .NET, Java, TypeScript, JavaScript, Rust and Python. Designed for developers, it focuses on practical techniques for building modular, scalable, and secure AI workflows from session setup to service orchestration.

AgentScope Java: Agent-Oriented Programming for Building LLM Applications

Incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one

JavaScript animation engine

🔪📦 Javascript decompiler for modern frontend

Dex to Java decompiler

Blazor Component Library based on Material Design principles. Do more with Blazor, utilizing CSS and keeping JavaScript to a bare minimum.

Java 面试 & 后端通用面试指南，覆盖计算机基础、数据库、分布式、高并发、系统设计与 AI 应用开发

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

⚓ A collection of high-performance JavaScript tools.

A modern JavaScript utility library that's 2-3 times faster and up to 97% smaller—a major upgrade to lodash.

JavaScript 3D Library.

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.

Node.js JavaScript runtime ✨🐢🚀✨

🍃 JavaScript library for mobile-friendly interactive maps 🇺🇦

Crawlee—A web scraping and browser automation library for Node.js to build reliable crawlers. In JavaScript and TypeScript. Extract data for AI, LLMs, RAG, or GPTs. Download HTML, PDF, JPG, PNG, and other files from websites. Works with Puppeteer, Playwright, Cheerio, JSDOM, and raw HTTP. Both headful and headless mode. With proxy rotation.

Fold Craft Launcher, an Android Minecraft : Java Edition launcher.

一个基于 JavaScript 的网盘文件下载地址获取工具。基于【网盘直链下载助手】修改 ，支持 百度网盘 / 阿里云盘 / 中国移动云盘 / 天翼云盘 / 迅雷云盘 / 夸克网盘 / UC网盘 / 123云盘 八大网盘

A modern animation library for React and JavaScript

Agentic AI Framework for Java Developers

AIFlowy is an enterprise-grade AI application development platform based on Java, comparable to products like Dify and Coze.

Socket-based TS/JavaScript API for WhatsApp Web

Codebase intelligence for TypeScript and JavaScript. Free static layer: unused code, duplication, circular deps, complexity hotspots, architecture boundaries. Optional paid runtime layer: hot-path review and cold-path deletion evidence from real production traffic. Rust-native, sub-second, 95 framework plugins.

Koog is a JVM (Java and Kotlin) framework for building predictable, fault-tolerant and enterprise-ready AI agents across all platforms – from backend services to Android and iOS, JVM, and even in-browser environments. Koog is based on our AI products expertise and provides proven solutions for complex LLM and AI problems

A cryptocurrency trading API with more than 100 exchanges in JavaScript / TypeScript / Python / C# / PHP / Go

OpenTelemetry JavaScript Client

SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.

:electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS

A polyglot document intelligence framework with a Rust core. Extract text, metadata, images, and structured information from PDFs, Office documents, images, and 97+ formats. Available for Rust, Python, Ruby, Java, Go, PHP, Elixir, C#, R, C, TypeScript (Node/Bun/Wasm/Deno)- or use via CLI, REST API, or MCP server.

A modern runtime for JavaScript and TypeScript.

The best JavaScript Data Table for building Enterprise Applications. Supports React / Angular / Vue / Plain JavaScript.

⭐️一款好用又强大的开源社区，基于 Spring Boot、MyBatis-Plus、MySQL、Redis、ElasticSearch、MongoDB、Docker、RabbitMQ 等主流技术栈，附详细教程，包括Java、Spring、MySQL、Redis、微服务&分布式、消息队列等核心知识点。学编程，就上技术派😁。

学之思开源考试系统是一款 java + vue 的前后端分离的考试系统。主要优点是开发、部署简单快捷、界面设计友好、代码结构清晰。支持web端和微信小程序，能覆盖到pc机和手机等设备。 支持多种部署方式：集成部署、前后端分离部署、docker部署。

List of 1000 JavaScript Interview Questions

WPPConnect is an open source project developed by the JavaScript community with the aim of exporting functions from WhatsApp Web to the node, which can be used to support the creation of any interaction, such as customer service, media sending, intelligence recognition based on phrases artificial and many other things, use your imagination

Java implementation of the Tron whitepaper

A tool to help eliminate NullPointerExceptions (NPEs) in your Java code with low build-time overhead

An open-source JavaScript library for world-class 3D globes and maps :earth_americas:

PDF Reader in JavaScript

Java AI application development framework (supports LLM-tool,skill; RAG; MCP; Agent-ReAct,Team-Agent). Compatible with java8 ~ java25. It can also be embedded in SpringBoot, jFinal, Vert.x, Quarkus, and other frameworks.

AI 低代码平台，「低代码 + 零代码」双模式驱动：低代码一键生成前后端代码，零代码 5 分钟搭建系统，AI Skills 一句话画流程、设计表单、生成整套系统。内置 AI聊天、知识库、流程编排、MCP插件等，兼容主流大模型。引领「AI 生成 → 在线配置 → 代码生成 → 手工合并->AI修改」开发模式，消除 Java 项目 80% 的重复工作，提效而不失灵活。

The official AWS SDK for Java - Version 2

A Java architecture test library, to specify and assert architecture rules in plain Java

Open Source Java e-Invoicing library, validator and tool (Factur-X/ZUGFeRD, UNCEFACT/CII XRechnung)

The AI framework that adds the engineering to prompt engineering (Python/TS/Ruby/Java/C#/Rust/Go compatible)

A JavaScript engine optimized for running React Native.

🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first.

Agents-flex is A Lightweight Java AI Application Development Framework.

🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.

A progressive Node.js framework for building efficient, scalable, and enterprise-grade server-side applications with TypeScript/JavaScript 🚀

A modern load testing tool, using Go and JavaScript

Build system optimized for JavaScript and TypeScript, written in Rust

Slint is an open-source declarative GUI toolkit to build native user interfaces for Rust, C++, JavaScript, or Python apps.

《代码随想录》LeetCode 刷题攻略：200道经典题目刷题顺序，共60w字的详细图解，视频难点剖析，50余张思维导图，支持C++，Java，Python，Go，JavaScript等多语言版本，从此算法学习不再迷茫！🔥🔥 来看看，你会发现相见恨晚！🚀

OpenTelemetry auto-instrumentation and instrumentation libraries for Java

Property based testing framework for JavaScript (like QuickCheck) written in TypeScript

Decompiler from Java bytecode to Java, used in IntelliJ IDEA.

Find and fix problems in your JavaScript code.

📝 Algorithms and data structures implemented in JavaScript with explanations and links to further readings

TypeScript & JavaScript ORM for Node.js — supports PostgreSQL, MySQL, MariaDB, SQLite, SQL Server, Oracle, and more.

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.

Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.

A high performance caching library for Java

Google's common Java, C++ and JavaScript library for parsing, formatting, and validating international phone numbers.

Babylon.js is a powerful, beautiful, simple, and open game and rendering engine packed into a friendly JavaScript framework.

Protocol Buffers for JavaScript & TypeScript.

OpenTelemetry instrumentation for JavaScript modules

JavaScript API for Chrome and Firefox

A Java serialization/deserialization library to convert Java Objects into JSON and back

🍃spring-rs is a application framework written in rust inspired by java's spring-boot

The JavaScript / Wasm runtime that powers Cloudflare Workers

A JavaScript codemod toolkit.

TypeScript/JavaScript 3D maps and geospatial data visualization engine library

MyBatis SQL mapper framework for Java

T.J. Watson Libraries for Analysis, with front ends for Java, Android, and JavaScript, and many common static program analyses.

Highcharts JS, the JavaScript charting framework

Fast Rust bundler for JavaScript/TypeScript with Rollup-compatible API.

支持 Python3、JavaScript、Shell、Typescript 的定时任务管理平台（Timed task management platform supporting Python3, JavaScript, Shell, Typescript）

😮 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

📜 33 JavaScript concepts every developer should know.

All Algorithms implemented in Java

Java library to create bots using Telegram Bots API

A JavaScript PDF generation library for Node and the browser

✨ 开源、免费、一站式 Java 权限认证框架，让鉴权变得简单、优雅！—— 登录认证、权限认证、分布式 Session 会话、微服务网关鉴权、SSO 单点登录、OAuth2.0 统一认证、jwt 集成、API Key 秘钥授权、API 参数签名

A JavaScript Engine Fuzzer

Generated Java code for Google APIs

Boa is an embeddable Javascript engine written in Rust.

Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with the Extensions for OpenJDK for OpenJ9 repo.

The JavaScript and API powered WordPress.com

Pure Javascript OCR for more than 100 Languages 📖🎉🖥

⚡ Write Native with TypeScript ✨ Best of all worlds (TypeScript, Swift, Objective C, Kotlin, Java, Dart). Use what you love ❤️ Angular, React, Solid, Svelte, Vue with: iOS (UIKit, SwiftUI), Android (View, Jetpack Compose), Flutter and you name it compatible.

A static analyzer for Java, C, C++, and Objective-C

Graphical Java application for managing BibTeX and BibLaTeX (.bib) databases

Joda-Time is the widely used replacement for the Java date and time classes prior to Java SE 8.

A javascript text differencing implementation.

A bridge/proxy allowing you to connect to Minecraft: Java Edition servers with Minecraft: Bedrock Edition.

Apache ShenYu is a Java native API Gateway for service proxy, protocol conversion and API governance.

OpenPDF is an open-source Java library for creating, editing, rendering, and encrypting PDF documents, as well as generating PDFs from HTML. It is licensed under the LGPL and MPL.

A powerful JavaScript library for interacting with the Discord API

TypeScript is a superset of JavaScript that compiles to clean JavaScript output.