Top 4 C# Webserver Projects

EmbedIO

3 1,426 0.0 C#

A tiny, cross-platform, module based web server for .NET

Project mention: Make MAUI app run a Web API Controller | /r/dotnetMAUI | 2023-05-27

I haven't used it, but EmbedIO looks like it's another option: https://github.com/unosquare/embedio
BeetleX

0 1,146 3.6 C#

high performance dotnet core socket tcp communication components, support TLS, HTTP, HTTPS, WebSocket, RPC, Redis protocols, custom protocols and 1M connections problem solution
WorkOS

workos.com
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The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Butterfly Server .NET

0 273 0.0 C#

The Everything is Real-Time C# Backend for Single Page Applications
nanoFramework.WebServer

1 29 7.7 C#

:package: Web server for nanoFramework packed with features: REST api using attributes, multithread requests, parameters in query URL, static files serving.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-05-27.