Top 20 NuGet websocket Packages

A library for android apps providing web socket implementation with inbuilt Rx support and error handling. Check https://github.com/harshmaurya/reactive-websocket for details.
GameServerFramework for .Net
Webster - A tiny .net core websocket server
websocket-sharp-based provider for Discord.Net, allowing it to run under Mono.
A .NET client for the GDAX REST API https://api.gdax.com.
A framework that allows you to quickly build webservers or embed webservers within an application. Easy Web API development, MVC support, (optional) inbuild security on api-method level, Automatic javascript api library generation, WebSocket support with inbuild security.
.Net Standard Async WebSocket Client Library
Phoenixframework Scoket Client library for .NET Framework, .NET Core, .NET Standard
NetMock is a .NET network service mock framework, inspired by Moq syntax, providing the ability to mock REST and web socket APIs from within a test framework of choice.
Sample url: https://wsecho.azurewebsites.net/ With this extension you can specify unlimited hub at run-time, initial client connection starts or join existing hub. Channels isolated by using hub. Ideal for application like multi room, p2p chat or IoT service channel implementations.
A lightweight publisher / subscriber implementation using WebSockets.
Provides an API to connect to the WebSocket Server of the Kai's SDK.
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Phoenixframework websocket protocol .NET implementation