Top 20 NuGet websocket Packages

GameServerFramework for .Net
See https://www.nuget.org/packages/WebSocketSharp for more info.
A gang relay for asp.net websockets written in dotnet core
An unofficial library for interacting with Stack Exchange chat, and the API
A C# implementation of the WebSocket protocol client and server
The .NET library for interacting with the Pusher WebSocket API. Register at http://pusher.com/.
A C# implementation of socket.io-emitter
NLog logging extension for Styx
A Windows Phone client of WebSocket-Rails
WebSocket extension for Expresharp with Fleck
Simple, lightweight, yet powerful way to build real-time HTML5/C# .NET web and mobile apps. Library for ASP.NET 4.5.
A portable SignalR client with websocket support.
Phoenix Framework WebSocket Client for .NET
An asynchronous easy to use WebSocket client
An asynchronous high-performance and easy to use WebSocket server
A WebSocket server for .NET Core 2.0 written in C#.
This library provides a simple HTTP server with WebSocket support. It has been forked to work with .NET Standard.
A server side implementation of the websocket protocol that complies with the Protocol Framework
Async WebSocket Listener and Client based on .Net Framework
Transport uses .NETStandard WebSocket implementation instead of defaul Mono implementation.