Teamcommunicatie

The most private and secure chat and applications platform - now with double ratchet E2E encryption.

XMPP instant messaging server.

XMPP server implementation in Java.

High-Performance server for NATS.io, the cloud and edge native messaging system.

Apache Kafka® running on Kubernetes

Fast, light and extensible chat client.

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

Apache Pulsar - distributed pub-sub messaging system

Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots.

IoT Platform Framework

An ultra-lightweight and blazing-fast Messaging Bus/MQTT Broker for Edge & SDV

DooTask是一款开源在线项目任务管理工具，提供各类文档协作工具、在线思维导图、在线流程图、项目管理、任务分发、即时IM，文件管理等工具；同时消息功能使用非对称加密技术让你的沟通更安全。

Language-agnostic real-time messaging (Websocket or SockJS) server.

bluetooth mesh chat, IRC vibes

Lightweight, self-hosted, open-source chat server with voice, video, text, and screen sharing. Built for small groups who want privacy, simplicity, and full control over their data.

Self-hosted web IRC client.

signal-cli provides an unofficial commandline, JSON-RPC and dbus interface for the Signal messenger.

IM Chat OpenClaw

XMPP chat client in your browser.

Advanced IRC bouncer.

A dead simple Go library for sending notifications to various messaging services.

best way to save what you love

Graphical client for the Soulseek peer-to-peer network

Real time collaboration (RTC) server.

Apache ActiveMQ

Spacebar server - A reimplementation of the Discord.com backend, built with Typescript and love

Modern IRCv3 server written in Go, combining the features of an ircd, a services framework, and a bouncer.

Apache Iggy: Hyper-Efficient Message Streaming at Laser Speed

Share sensitive information securely with self-destructing links that are only viewable once.

🐙 The Go backend powering OCTO — an open workplace built for humans × AI agents. REST & WebSocket APIs, Lobster (AI agent) orchestration, and WuKongIM real-time messaging control plane.

Modular, advanced and highly configurable IRC server written in C for Linux, BSD, Windows, and macOS.

Telegram Server written in C# (Unofficial) - messaging, channels, media, secret chats and voice/video calls.

Open source RabbitMQ: core server and tier 1 (built-in) plugins

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

Messaging library for Python.

Modular IRC server written in C++ for Linux, BSD, Windows, and macOS.

An easy to use .NET API for RabbitMQ

In-memory message queue with an Amazon SQS-compatible interface. Runs stand-alone or embedded.

Rust client for NATS, the cloud native messaging system.

A modern high-performance open source message queuing system

Mobile messaging platform with a focus on performance and scalability.

WhatsApp desktop application written in PyQt6 + PyQt6-WebEngine.

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

RocketMQ企业级一站式服务平台

Apache Artemis

Portable and lightweight Internet Relay Chat server for small or private networks.

ChatLayout is an alternative solution to MessageKit. It uses custom UICollectionViewLayout to provide you full control over the presentation as well as all the tools available in UICollectionView. It supports dynamic cells and supplementary view sizes.

Web frontend from Salut à Toi.

Multipurpose, multi frontend, libre and decentralized communication tool.

All-in-one Dockerized easy XMPP solution, including web admin and clients.

Tinode chat client application for Android

MQTT Server/MQTT Broker - Scalable Distributed MQTT Message Broker for IoT in the 5G Era

Telegram MCP server powered by Telethon to let MCP clients read chats, manage groups, and send/modify messages, media, contacts, and settings.

A curated list of awesome tips and tricks, resources, videos and articles in .NET, Software Architecture, Cloud-Native, Data and AI.

AMQP client library in Rust, with a clean, futures based API

Distributed Application Framework for .NET

The most widely used PHP client for RabbitMQ

ZapFast: a fast, native WhatsApp client in Rust and egui

🚀 Apache RocketMQ built in Rust 🦀 — faster, safer, and more memory-efficient. Powering high-performance messaging for the AI era, with AI Agent, MCP, and AI-SRE capabilities.

Eclipse Mosquitto - An open source MQTT broker

ZeroMQ core engine in C++, implements ZMTP/3.1

:satellite: BroadcastChannel to send data between different browser-tabs or nodejs-processes :satellite: + LeaderElection over the channels https://pubkey.github.io/broadcast-channel/

Real-time messaging library for Go. The simplest way to add feature-rich and scalable WebSocket support to your application. The core of Centrifugo server.

Web & desktop (Electron) client for the OCTO open workplace — one React + TypeScript codebase shipping browser and PC surfaces, with first-class AI agent UX.

Vonage Server SDK for Python. API support for Voice, SMS, WhatsApp, Verify (2FA), Video Meetings and more.

golang im server

Kafka-style message streaming in Go. Built on NATS. Single binary, no JVM, no ZooKeeper.

A native implementation of ØMQ in Rust

A community-driven replacement for JSQMessagesViewController

Alpakka is a Reactive Enterprise Integration library for Java and Scala, based on Reactive Streams and Akka.

Framework for building Event-Driven Microservices

A web frontend for WeeChat.

zenoh unifies data in motion, data in-use, data at rest and computations. It carefully blends traditional pub/sub with geo-distributed storages, queries and computations, while retaining a level of time and space efficiency that is well beyond any of the mainstream stacks.

A realtime distributed messaging platform

RabbitMQ Bundle for the Symfony web framework

Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network

Unofficial open source mtproto server written in golang with compatible telegram client.

Fast and reliable message broker built on top of Kafka.

Sharding and location transparency for Scala

Crossbar.io - WAMP application router

Ncurses based XMPP client

Threema App for Android.

Vonage REST API client for PHP. API support for SMS, Voice, Text-to-Speech, Numbers, Verify (2FA) and more.

Ruby client for NATS, the cloud native messaging system.

PingMe - A unified CLI and web service for sending notifications across multiple messaging platforms

Javascript and Typescript Stomp client for Web browsers and node.js apps

An AI agent for teams, communities, and multi-user environments.

The gold standard for async .NET microservices on Azure, AWS and on-prem

A 100% native C# implementation of ZeroMQ for .NET

A practical microservices with the latest technologies and architectures like Vertical Slice Architecture, Event Sourcing, CQRS, DDD, gRpc, MongoDB, RabbitMq, Wolverine, and Aspire in .Net 10.

Franz is a free messaging app for services like WhatsApp, Slack, Messenger and many more.

:bus: Simple and lean service bus implementation for .NET

JeroMQ is a pure Java implementation of the ZeroMQ messaging library, offering high-performance asynchronous messaging for distributed or concurrent applications.

:speech_balloon: Android Chat SDK ➜ Stream Chat API. UI component libraries for chat apps. Kotlin & Jetpack Compose messaging SDK for Android chat

Responsive web IRC client with theming support.

IRC without netsplits. Distributed IRC server, based on RobustSession protocol.

Eclipse Hono™ Project

Notification library for gophers and their furry friends.

Orchestrate end-to-end encryption, cryptographic identities, mutual authentication, and authorization policies between distributed applications – at massive scale.

Distributed IRC client, meaning that one (or multiple) client(s) can attach to and detach from a central core.

Bunny is a popular, easy to use, mature Ruby client for RabbitMQ

Kafka implemented in Golang with built-in coordination (No ZK dep, single binary install, Cloud Native)

💨 A real time messaging system to build a scalable in-app notifications, multiplayer games, chat apps in web and mobile apps.

Flutter Chat SDK - Build your own chat app experience using Dart, Flutter and the Stream Chat Messaging API.

JSON-RPC 2.0 implementation over WebSockets for Node.js and JavaScript/TypeScript

💬 iOS Chat SDK in Swift - Build your own app chat experience for iOS using the official Stream Chat API

Voice & Video Calling and Text Chat App for React Native

⬆ Dead simple, dependency-less, spec-compliant server-sent events implementation written in TypeScript

C API for Zenoh

即时通讯，聊天，野火IM iOS客户端

Messaging patterns for Backbone applications.

Bidirectional Channels for JavaScript

Simple service bus for sending events between processes using amqp.

An improved drop-in replacement for SQS

Chat SDK Android - Open Source Mobile Messenger

Secure chat software for your computer.

Iris is a highly configurable and flexible service for paging and messaging.

⚡️ A framework for building conversational user interfaces.

The most beautiful SMS messenger for Android

Chat SDK iOS - Open Source Mobile Messenger

Timy - open source mobile app for groups to communicate and organize themselves. Built with flutter.

Messaging APIs for multi-platform

Android library. Flexible components for chat UI implementation with flexible possibilities for styling, customizing and data management. Made by Stfalcon

A reactive Single-Page Instagram-Clone with some new features!! 💪📸👓 - No longer maintained.

An UITextView in Swift. Support auto growing, placeholder and length limit.

Anonymous peer-to-peer instant messaging

ChatSecure is a free and open source encrypted chat client for iOS that supports OTR and OMEMO encryption over XMPP.

Private messaging system that hides metadata

The telephone, a supernatural instrument before whose miracles we used to stand amazed, and which we now employ without giving it a thought, to summon our tailor or order an ice cream. --M.Proust