Fleck

SuperSocket

SuperSocket is a high-performance, extensible socket server application framework for .NET. It provides a robust architecture for building custom network communication applications with support for multiple protocols including TCP, UDP, and WebSocket.

SignalR Server

[Archived] Incredibly simple real-time web for ASP.NET Core. Project moved to https://github.com/aspnet/AspNetCore

websocket-manager

Real-Time library for ASP .NET Core

WampSharp

A C# implementation of WAMP (The Web Application Messaging Protocol)