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.

Realtime server for reliable two-way communication to power-up any backend

A secure, efficient TCP/UDP tunneling solution that delivers fast, reliable access across network restrictions using pre-established TCP/QUIC/WebSocket or HTTP/2 connections.

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.

Server Sent Events server and client for Golang

Fully featured, spec-compliant HTML5 server-sent events library

Sky — an Elm-inspired language that compiles to Go. Hindley-Milner types, server-driven UI (Sky.Live), single binary output.

A lightweight Model Context Protocol (MCP) server that enables AI assistants like Claude to retrieve and interpret real-time weather data. Discuss on Hacker News:

KaGo

Server-Sent Events for Go

Making it easier to push pubsub events directly to the browser.

Uses just 1% memory while protecting 99% of your personal privacy.

High-performance, multi-protocol mock server. HTTP, WebSocket, gRPC, MQTT, SSE, GraphQL, SOAP in one binary.

🏄 High-performance Server-Sent Events endpoint for Go

Server-Sent Events for Go. A tiny, dependency-free, spec-compliant library compatible with the HTTP stdlib.

HTML5 Server-Sent-Events for Go

Pulsar Beam is a streaming service via HTTP built on Apache Pulsar.

One connection for all your MCP servers.

Open Source Realtime Tracking System

A k6 extension for Server-Sent Events (SSE)