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 

ASP.NET SignalR is a library for ASP.NET developers that makes it incredibly simple to add real-time web functionality to your applications. It's the ability to have your server-side code push content to the connected clients as it happens, in real-time. SignalR also provides a very simple, high-level API for doing server to client RPC (call JavaScript functions in your clients' browsers from server-side .NET code) in your ASP.NET application.

SignalR - Incredibly simple real-time web for .NET

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. 
 
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.

 Restbed is a comprehensive and consistent programming model for building applications that require seamless and secure communication over HTTP, with the ability to model a range of business processes, designed to target mobile, tablet, desktop and embedded production environments. More in-depth examples can be found here. 

RestBed - Asynchronous RESTful functionality to C++11 applications

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 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 

Laverna is a JavaScript note-taking web application with a Markdown editor and encryption support. It's built to be an open source alternative to Evernote. The application stores all your notes in your browser databases such as indexedDB or localStorage, which is good for security reasons, because only you have access to them.
 
Data is secured using client-side encryption, Manage your notes, even when you're offline, Synchronizes with cloud storage services (currently only with Dropbox and RemoteStorage), Syntax highlighting, MathJax support.

Laverna is a JavaScript note-taking web application with a Markdown editor and encryption support. It's built to be an open source alternative to Evernote. The application stores all your notes in your browser databases such as indexedDB or localStorage, which is good for security reasons, because only you have access to them.

Laverna - Note taking application with Markdown editor and encryption support

The Akka HTTP modules implement a full server- and client-side HTTP stack on top of akka-actor and akka-stream. It's not a web-framework but rather a more general toolkit for providing and consuming HTTP-based services. While interaction with a browser is of course also in scope it is not the primary focus of Akka HTTP. 
 
Akka HTTP follows a rather open design and many times offers several different API levels for "doing the same thing". You get to pick the API level of abstraction that is most suitable for your application. This means that, if you have trouble achieving something using a high-level API, there's a good chance that you can get it done with a low-level API, which offers more flexibility but might require you to write more application code.

The Akka HTTP modules implement a full server- and client-side HTTP stack on top of akka-actor and akka-stream. It's not a web-framework but rather a more general toolkit for providing and consuming HTTP-based services. While interaction with a browser is of course also in scope it is not the primary focus of Akka HTTP. 

Akka HTTP - The Streaming-first HTTP server/module of Akka

Gorilla WebSocket is a Go implementation of the WebSocket protocol.The Gorilla WebSocket package provides a complete and tested implementation of the WebSocket protocol. It passes Autobahn Test Suite, Receive fragmented message, Send pings and receive pongs, Read message using io.Reader, Write message using io.WriteCloser and lot more.

Gorilla WebSocket - A WebSocket implementation for Go.

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

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