Server Sent Events GitHub Repositories (2026) · Open Source Tools

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.

A proxy server for adding push to your API, used at the core of Fastly's Fanout service

🪽 An open, easy, fast, reliable and battery-efficient solution for real-time communications

Small self-contained pure-Go web server with Lua, Teal, Markdown, HTTP/2, QUIC, Redis, TypeScript, npm-less React 19, SQLite, and PostgreSQL support ++

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

Azure SignalR Service SDK for .NET

REST framework for Delphi: JAX-RS style resources and routes, servers and clients, JWT, OpenAPI 3, FireDAC and Devart UniDAC/MyDAC/IBDAC, SSE, MCP servers for AI agents. Windows, Linux, Docker.

The MercureBundle allows to easily push updates to web browsers and other HTTP clients in the Symfony full-stack framework, using the Mercure protocol.

The surprisingly performant, Nushell-scriptable, cross.stream-powered, Datastar-ready HTTP server that fits in your back pocket. 🐘💫🚀💜

Native WebSocket RPC and reactive subscriptions for SvelteKit

EventBus library for sending events from a Spring appliction to the web browser with SSE