SockJS is a browser JavaScript library that provides a WebSocket-like object. SockJS gives you a coherent, cross-browser, Javascript API which creates a low latency, full duplex, cross-domain communication channel between the browser and the web server. Under the hood SockJS tries to use native WebSockets first. If that fails it can use a variety of browser-specific transport protocols and presents them through WebSocket-like abstractions.

Sockjs Client - WebSocket Emulation 

Productive. Reliable. Fast. Most web frameworks make you choose between speed and a productive environment. Phoenix gives you both. It leverages the Erlang VM ability to handle millions of connections alongside Elixir's beautiful syntax and productive tooling for building fault-tolerant systems. 
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It also has some interesting new twists like channels for implementing realtime features and pre-compiled templates for blazing speed.

Productive. Reliable. Fast. Most web frameworks make you choose between speed and a productive environment. Phoenix gives you both. It leverages the Erlang VM ability to handle millions of connections alongside Elixir's beautiful syntax and productive tooling for building fault-tolerant systems. 

Phoenix - A productive web framework that does not compromise speed and maintainability.

Sails.js is a web framework that makes it easy to build custom, enterprise-grade Node.js apps. It is designed to resemble the MVC architecture from frameworks like Ruby on Rails, but with support for the more modern, data-oriented style of web app development. It's especially good for building realtime features like chat.
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Sails actions are compatible with Connect middleware, so in most cases, you can paste code into Sails from an existing Express project and everything will work-- plus you'll be able to use WebSockets to talk to your API, and vice versa. Sails translates incoming socket messages for you, they're automatically compatible with every route in your Sails app.

Sails.js is a web framework that makes it easy to build custom, enterprise-grade Node.js apps. It is designed to resemble the MVC architecture from frameworks like Ruby on Rails, but with support for the more modern, data-oriented style of web app development. It's especially good for building realtime features like chat.

Sails.js - Realtime MVC Framework for Node.js

Hoppscotch is an open source API development ecosystem. It is light weight and can send fast requests and get/copy responses in real-time. It supports WebSocket, Server Sent Events, Socket.IO, MQTT and GraphQL. You can also install as a PWA (Progressive Web App) on your device.

Hoppscotch - Open source API development ecosystem 

mitmproxy is an interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers. mitmproxy is an interactive, SSL-capable intercepting proxy with a console interface. mitmdump is the command-line version of mitmproxy. Think tcpdump for HTTP. mitmweb is a web-based interface for mitmproxy. 

mitmproxy -  Intercept HTTP traffic for penetration testing

 A high performance websocket server library powering Stack Overflow. 

NetGain -  A high performance websocket server library powering Stack Overflow. 

Conforming WebSocket (RFC 6455) client library for iOS and Mac OSX.SwiftWebSocket passes all 521 of the Autobahn's fuzzing tests, including strict UTF-8, and message compression.

SwiftWebSocket - Fast Websockets in Swift for iOS and OSX

node-http-proxy is an HTTP programmable proxying library that supports websockets. It is suitable for implementing components such as reverse proxies and load balancers. When a request is proxied it follows two different pipelines, The first pipeline (incoming) is responsible for the creation and manipulation of the stream that connects your client to the target. The second pipeline (outgoing) is responsible for the creation and manipulation of the stream that, from your target, returns data to the client.

node-http-proxy - A full-featured http proxy for NodeJS

A barebones WebSocket client and server implementation written in 100% Java. The underlying classes are implemented java.nio, which allows for a non-blocking event-driven model (similar to the WebSocket API for web browsers).

Java-WebSocket - A barebones WebSocket client and server implementation written in 100% Java.

Node Media Server is a Node.js implementation of RTMP / HTTP-FLV / WS-FLV / HLS / DASH Media Server. It supports H.264 / H.265(flv_id=12) / AAC / MP3 / SPEEX / NELLYMOSER / G.711 / OPUS(flv_id=13), GOP cache, Rtsp / Rtmp relay, Real-time multi-resolution transcoding.


Node Media Server - A Node.js implementation of RTMP/HTTP-FLV/WS-FLV/HLS/DASH/MP4 Media Server

An AngularJS 1.x WebSocket service for connecting client applications to servers.This type is returned from the send() instance method of $websocket, inherits from $q.defer().promise.

Angular Websocket - The missing Angular WebSocket module for connecting client applications to servers by @AngularClass

JsSIP is the JavaScript SIP Library. It is SIP over WebSocket (use real SIP in your web apps). JsSIP makes use of the WebRTC stack present in modern web browsers for enabling audio/video realtime communication. It comes with an easy JavaScript API that provides the user with full flexibility over the SIP application running in the web.

JsSIP - the JavaScript SIP library

The soketi server is built on top of uWebSockets.js - a C application ported to Node.js. uWebSockets.js is demonstrated to perform at levels 8.5x that of Fastify and at least 10x that of Socket.IO. It implements the Pusher Protocol v7. Therefore, any Pusher-maintained or compatible client can connect to it, bringing a plug-and-play experience for existing applications that are already compatible with this protocol.

Soketi - Just another simple, fast, and resilient open-source WebSockets server

Centrifugal organization is a set of tools to add real-time features on your web site. It brings together several repositories linked by a common purpose – give you a complete and ready to use solution when you want to add real-time events into your web application like Chats, Real-time charts, Notifications, Various counters and even games. 

Centrifugal - Real time messaging in Web applications

Laravel Echo is a JavaScript library that makes it painless to subscribe to channels and listen for events broadcast by your server-side broadcasting driver. Laravel makes it easy to "broadcast" your events over a WebSocket connection. Broadcasting your Laravel events allows you to share the same event names between your server-side code and your client-side JavaScript application.

Laravel Echo - Javascript library for beautiful Pusher and Ably integration

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