Cost / License
- Free
- Open Source
Platforms
- Mac
- Windows
- Linux
- JavaScript
- Node.JS
Faye is a set of tools for simple publish-subscribe messaging between web clients. It ships with easy-to-use message routing servers for Node.js and Rack applications, and clients that can be used on the server and in the browser.
Minimalist, privacy-first synchronized video playback for YouTube, Netflix, Emby, and general HTML5. Built with pure Vanilla JS and a Node.js relay.




Crossbar.io is a router for the open WebSocket Application Messaging Protocol, and it is open source. Together with the open source WebApplicationMessagingProtocol client libraries it is a connection fabric for components in distributed applications.
Free, privacy-first API client built natively into VS Code. Test REST, GraphQL & WebSocket APIs locally — no login, no cloud sync, no telemetry.




noPoll is a OpenSource WebSocket implementation (RFC 6455), written in ansi C, that allows building pure WebSocket solutions or to provide WebSocket support to existing TCP oriented applications.
Chatter is the first and most popular PHP chat script ever! Chatter is a mobile-friendly HTML5 template designed script.



DockGraph is a free, self-hostable tool for visualizing Docker setups. It connects to the Docker socket and shows your running environment as a live interactive topology map, making it easier to understand how everything is connected at a glance.




Tetiva is a desktop API client for HTTP, gRPC, GraphQL and WebSocket. It is built with Go and Wails on the system web view rather than Electron, so the download is around 30 MB.




Beebotte is a cloud platform providing key building blocks to accelerate the development of the Internet of Things and Real time connected applications. Beebotte supports REST, Websockets and MQTT to connect anything and everything in real time.
If you’re tired of using complicated chat servers with too many features that you don’t use, or if you’re looking for a more intuitive and comprehensive chat platform, then you might want to try a Simple but Advanced Messaging Alternative (SAMA) chat server.




A high performance (Async), message oriented network library built for real time systems. It provides a core extensible framework and libraries built on top of the core. Libraries include WebSocket server, HTTP Server and Client and Boson a custom serialization and RMI library.

Home Automation Software on Open-Source managing BeagleBone Black boards with Webcams under Angstrom Linux.



Free desktop API mocking platform. Create HTTP/REST and WebSocket mock servers with a modern UI. Perfect for developers, QA teams, and trainers.

Reachlo is a drop-in real-time streaming backend for any application that needs live data. It supports AI token streaming, chat, collaborative editing, live dashboards, notifications, IoT event streams, and more.



Laravel WebSockets is a package for Laravel and up that will get your application started with WebSockets in no-time! It has a drop-in Pusher API replacement, has a debug dashboard, realtime statistics and even allows you to create custom WebSocket .
FinestCream is a no-code solution for creating Socket.IO and WebSocket mock servers. FinestCream simulates the behavior of a real server for testing client events.




Zunoy FreeMQTT is an online MQTT broker. It helps developers connect devices and exchange messages using the MQTT protocol. They do not need to set up their broker.



Essential companion app for developers using AI assistants like Claude, Cursor, and Windsurf. Bridge AI-powered workflows with mobile task management.



The BitcoinAverage Cryptocurrency API provides real time Websocket and Historical Price price data for hundreds of cryptocurrencies.




