Jetty provides an HTTP server, HTTP client, and javax.servlet container. Jetty is used in a wide variety of projects and products. Jetty can be embedded in devices, tools, frameworks, application servers and clusters. Its features include Asynchronous HTTP Server, Web Sockets server, Application Server Integrations and lot more.

Jetty - WebServer and Servlet Container

Ratchet is a loosely coupled PHP library providing developers with tools to create real time, bi-directional applications between clients and servers over WebSockets. A PHP 5.3 library for asynchronously serving WebSockets. Build up your application through simple interfaces and re-use your application without changing any of its code just by combining different components.

Ratchet - PHP WebSocket library

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

Libwebsockets is a lightweight pure C library built to use minimal CPU and memory resources, and provide fast throughput in both directions. It can     be configured to use OpenSSL or CyaSSL to provide fully encrypted client and server links including client certificate support.

Libwebsockets - C library for lightweight websocket clients and servers

WebSocket++ is a header only C++ library that implements RFC6455 The WebSocket Protocol. It allows integrating WebSocket client and server functionality into C++ programs. It uses interchangeable network transport modules including one based on raw char buffers, one based on C++ iostreams, and one based on Asio (either via Boost or standalone). End users can write additional transport policies to support other networking or event libraries as needed.
 
<ul>
<li>Full support for RFC6455</li>
<li>Partial support for Hixie 76 / Hybi 00, 07-17 draft specs (server only)</li>
<li>Message/event based interface</li>
<li>Supports secure WebSockets (TLS), IPv6, and explicit proxies.</li>
<li>Flexible dependency management (C++11 Standard Library or Boost)</li>
<li>Interchangeable network transport modules (raw, iostream, Asio, or custom)</li>
<li>Portable/cross platform (Posix/Windows, 32/64bit, Intel/ARM/PPC)</li>
<li>Thread-safe</li>
</ul>

WebSocket++ is a header only C++ library that implements RFC6455 The WebSocket Protocol. It allows integrating WebSocket client and server functionality into C++ programs. It uses interchangeable network transport modules including one based on raw char buffers, one based on C++ iostreams, and one based on Asio (either via Boost or standalone). End users can write additional transport policies to support other networking or event libraries as needed.

WebSocket++ - C++ Websocket client/server library

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 Grizzly NIO framework has been designed to help developers to take advantage of the Java NIO API. Grizzlys goal is to help developers to build scalable and robust servers using NIO as well as offering extended framework components: Web Framework (HTTP/S), WebSocket, Comet, and more!

Grizzly - NIO Event Development in Java

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

OpenLiteSpeed is a high-performance, lightweight, open source HTTP server developed and copyrighted by LiteSpeed Technologies. It is event driven and it can handle hundreds of thousands of concurrent connections without load spikes.
 
Its feature include: 
<UL>
<LI>WebAdmin GUI with real-time statistics.</LI>
<LI>Rewrite engine uses Apache mod_rewrite syntax.</LI>
<LI>High-performance page caching.</LI>
<LI>Gzip compression for reduced bandwidth use.</LI>
<LI>HTTPS up to 4x faster than Apache.</LI>
<LI>Supports PHP, Ruby, Python, Perl, and Java external applications.</LI>
<LI>Buffers requests and responses to external applications to more efficiently serve multiple connections.</LI>
<LI>Apache-compatible SSI support.</LI>
<LI>Bandwidth and connection throttling.</LI>
<LI>Chunked transfer encoding.</LI>
<LI>IPv4 and IPv6 support.</LI>
<LI>Load balancing.</LI>
<LI>WebSocket proxy support. </LI>
<LI>mp4 and flv streaming. </LI>
<LI>Easy virtual host configuration via templates.</LI>
<LI>Can serve as a reverse proxy to accelerate static content delivery, compress throughput, or run security.</LI>
</UL>

OpenLiteSpeed is a high-performance, lightweight, open source HTTP server developed and copyrighted by LiteSpeed Technologies. It is event driven and it can handle hundreds of thousands of concurrent connections without load spikes.


OpenLiteSpeed -  High performance, lightweight, HTTP server

Symphony is a modern community platform. It implements a content oriented discussion forum. It includes a social network for users to share, make friends, and play games. It has the ability to aggregate independent bloggers, to build and share quality resources. 

Symphony - A modern community (forum/BBS/SNS/blog) platform written in Java

Back in the early days of the web there was this wonderful Perl library called CGI.pm, many people only learned Perl because of it. It was simple enough to get started without knowing much about the language and powerful enough to keep you going, learning by doing was much fun. While most of the techniques used are outdated now, the idea behind it is not. Mojolicious is a new attempt at implementing this idea using state of the art technology.

Mojolicious - Web framework for Perl

Niltalk is a web based disposable chat server. It allows users to create password protected disposable, ephemeral chatrooms and invite peers to chat rooms. Rooms can be disposed of at any time. It supports in-memory / file / Redis as the backend for persisting room and session states.

Niltalk - A multi-room disposable chat service written in Go that uses WebSockets for live communication

Tiny WebSocket middleware for Node.js based on ws. Inspired by koa-easy-ws.



tinyws - Tiny WebSocket middleware for Node.js

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