#messaging

An easy to use .NET API for RabbitMQ

Framework for automated integration tests with focus on message-based applications

Crossbar.io - WAMP application router

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

Harper is an open-source Node.js performance platform that unifies database, cache, application, and messaging layers into one in-memory process.

Java client for NATS

Terminal chat for developers: Go WebSocket server + Bubble Tea TUI client, optional E2E, reactions, DMs, channels, plugins, files, code snippets, admin UI. Backends: SQLite, PostgreSQL, or MySQL. Self-hosted.

Taking the Java out of Kafka

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

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

Klarna's React Native wrapper for the In-App SDK

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

PubNub JavaScript SDK docs https://www.pubnub.com/docs/sdks/javascript

Lightweight message bus interface for .NET (pub/sub and request-response) with transport plugins for popular message brokers.

bluetooth mesh chat, IRC vibes

A Node library for communicating with the Plivo API and generating Plivo XML.

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

Shared Protocol Buffers and their associated generated code

An application development platform

Agent Communication Envelope and Utilities

MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker). The implementation is based on the documentation from http://mqtt.org/.

A command-line interface for Convos — privacy-focused ephemeral messaging built on XMTP.

Headless Slack for AI agents. A hosted messaging store + router with fast retrieval

Well integrated, advanced private discussions for your Flarum forum.

Modular .NET messaging for commands, queries, events, durable inbox and outbox processing, sagas, and broker transports.

Lite & fast micro PHP messaging library that is **easy to use**.