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A realtime distributed messaging platform
Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.
SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps 📱!
The most scalable and reliable MQTT broker for AI, IoT, IIoT and connected vehicles
Apache Pulsar - distributed pub-sub messaging system
Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots
Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably, socket.io, Phoenix.PubSub, SignalR. Set up once and forever.
Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network
Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)
Franz is a free messaging app for services like WhatsApp, Slack, Messenger and many more.
Apache Heron (Incubating) is a realtime, distributed, fault-tolerant stream processing engine from Twitter
Graphical client for the Soulseek peer-to-peer network
Keep passwords and other sensitive information out of your chat logs and inboxes.
Apache ActiveMQ
RocketMQ企业级一站式服务平台
MongooseIM is Erlang Solutions' robust, scalable and efficient XMPP server, aimed at large installations. Specifically designed for enterprise purposes, it is fault-tolerant and can utilise the resources of multiple clustered machines.
🚀Apache RocketMQ build in Rust🦀. Faster, safer, and with lower memory usage. ⭐ Star to support our work❤️!
Bunny is a popular, easy to use, mature Ruby client for RabbitMQ
Telegram MCP server powered by Telethon to let MCP clients read chats, manage groups, and send/modify messages, media, contacts, and settings.
Fast and reliable message broker built on top of Kafka.
PingMe - A unified CLI and web service for sending notifications across multiple messaging platforms
Iris is a highly configurable and flexible service for paging and messaging.
SDK monorepo for Ethora chat / messaging platform. (1) Pick an SDK for your frontend stack. (2) Integrate manually or using ethora-setup. (3) Optionally configure app settings, deploy AI agents etc. Server: ethora.com cloud [free]. Dedicated server + SLA option for enterprise customers.
(M) Highly optimized, extremely modular and very flexible XMPP/Jabber server
Tinode web chat using React
Idiomatic, fast and well-maintained JRuby client for RabbitMQ
Claw-Social — AI Agent social discovery network plugin for OpenClaw
SimpleX channel plugin for OpenClaw.
An anonymous feedback platform with realtime chat messenger!
MCP Server for Telegram-Archive — search messages, browse chats, and access archived Telegram history via MCP