modelcontextprotocol / java-sdk

The official Java SDK for Model Context Protocol servers and clients. Maintained in collaboration with Spring AI

apache / shenyu

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

traccar / traccar

Open source GPS tracking platform - self-hosted or managed, 200+ device protocols

GeyserMC / Geyser

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

bethington / ghidra-mcp

Ghidra MCP Server — 200+ MCP tools for AI-powered reverse engineering. GUI plugin + headless server, lazy tool loading, convention enforcement, batch operations, Ghidra Server integration, and Docker deployment.

jitsi / jitsi

Jitsi is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, IRC and many other useful features.

tronprotocol / java-tron

Java implementation of the Tron whitepaper

dtinit / data-transfer-project

The Data Transfer Project makes it easy for platforms to build interoperable user data portability features. We are establishing a common framework, including data models and protocols, to enable direct transfer of data both into and out of participating online service providers.

zinja-coder / jadx-ai-mcp

Plugin for JADX to integrate MCP server

opensolon / solon

🔥 Java enterprise application development framework for full scenario: Restrained, Efficient, Open, Ecologicalll!!! 700% higher concurrency 50% memory savings Startup is 10 times faster. Packing 90% smaller; Compatible with java8 ~ java26; Supports LTS. (Replaceable spring)

Peergos / Peergos

A p2p, secure file storage, social network and application protocol

eclipse-jdtls / eclipse.jdt.ls

Java language server

smithy-lang / smithy

Smithy is a protocol-agnostic interface definition language and set of tools for generating clients, servers, and documentation for any programming language.

DSheirer / sdrtrunk

A cross-platform java application for decoding, monitoring, recording and streaming trunked mobile and related radio protocols using Software Defined Radios (SDR). Website:

aklivity / zilla

🦎 A lightweight, multi-protocol gateway for event-driven applications and AI agents. Expose and govern Kafka, MQTT, APIs, and MCP through one high-performance engine with shared routing, security, schema, and observability.

apache / ratis

Open source Java implementation for Raft consensus protocol.

dmulloy2 / ProtocolLib

Provides read and write access to the Minecraft protocol with Bukkit.

pnoker / iot-dc3

IoT DC3 — Connect the Physical World to AI. An open-source Industrial IoT Runtime for Physical AI: 36 protocol drivers, edge-to-cloud data delivery, and an MCP tool gateway so AI agents act on devices in a safe, controllable, traceable loop.

appium / java-client

Java language binding for writing Appium Tests, conforms to W3C WebDriver Protocol

hivemq / hivemq-community-edition

HiveMQ CE is a Java-based open source MQTT broker that fully supports MQTT 3.x and MQTT 5. It is the foundation of the HiveMQ Enterprise Connectivity and Messaging Platform

mateaix / mateclaw

🤖 MateClaw — Your second brain with Multi-Agent Orchestration, MCP Protocol, Skills & Memory, Dream, and Multi-Channel Support. Built on Spring AI Alibaba.

quickfix-j / quickfixj

QuickFIX/J is a full featured messaging engine for the FIX protocol. - This is the official project repository.

hivemq / hivemq-mqtt-client

HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support

dnsjava / dnsjava

dnsjava - an implementation of the DNS protocol in Java

retrooper / packetevents

PacketEvents is a protocol library tailored to Minecraft Java Edition, designed to facilitate the processing and transmission of packets.

GeyserMC / MCProtocolLib

A library for communication with a Minecraft client/server.

eclipse-lsp4j / lsp4j

A Java implementation of the language server protocol intended to be consumed by tools and language servers implemented in Java.

eclipse-leshan / leshan

Java Library for LWM2M

rsksmart / rskj

RSKj is a Java implementation of the Rootstock protocol.

ViaVersion / ViaFabricPlus

Minecraft Fabric mod that allows you to join every Minecraft server version (Classic, Alpha, Beta, Release, April Fools, Bedrock)

ViaVersion / ViaProxy

Standalone proxy which allows players to join EVERY Minecraft server version (Classic, Alpha, Beta, Release, Bedrock)

scalecube / scalecube-services

Microservices library - scalecube-services is a high throughput, low latency reactive microservices library built to scale. It features: API-Gateways, service-discovery, service-load-balancing, the architecture supports plug-and-play service communication modules and features. built to provide performance and low-latency real-time stream-processing

xipki / xipki

XiPKI: Compact open source PKI (CA, OCSP responder, certificate protocols ACME, CMP, EST, SCEP), with full support of PQC MLDSA (Dilithium) and MLKEM (Kyber).

bengtmartensson / IrScrutinizer

IrScrutinizer is a program for IR signal analysis, decoding, generation and much more.

a2aproject / a2a-java

Official Java SDK for the Agent2Agent (A2A) Protocol

ptrd / kwik

A QUIC client, client library and server implementation in Java. Supports HTTP3 with "Flupke" add-on.

nvxtien / emporia

Emporia is a microservices-based trading platform built with Spring Boot, React and PostgreSQL, featuring real-time market data, order management, execution strategies, and OAuth2 security.

2005selene2005-a11y / susu-phone-agent

Android device bridge for Claude Code via MCP + Shizuku. No root, no model polling.