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C# https-server

Open-source C# projects categorized as https-server
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C# https-server Projects

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  1. NetCoreServer

    Ultra fast and low latency asynchronous socket server & client C# .NET Core library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution

    Project mention: Ask HN: What Are You Working On? (February 2026) | news.ycombinator.com | 2026-02-08

    I'm working on a "toy" .NET web framework that has no dependencies on the ASP.NET Core Web SDK, runs fully on the "base" .NET Core SDK and can easily be embedded in existing applications.

    https://github.com/WispFramework/Wisp, https://wispframework.github.io/Wisp/

    It tries to be reasonably lightweight but batteries-included, with extra features in separate "extensions" packages. It's also designed to be modular. All functionality has a default implementation but can easily be replaced if desired. It uses the Fluid template engine[1] (a .NET implementation of the Liquid language).

    It's been a great way to dig into more advanced concepts like reflection and HTTP internals and while it's probably not safe to use in production, I have used it to build small private apps with great success.

    The current major pain points are the lack of websocket support, which I'm planning to add soon, and the general fragility of the NetCoreServer[2] based HTTP backend, which I'm planning to replace with EmbedIO. (Ideally, I would love to use Kestrel here, but it's so deeply baked into ASP.NET Core that you can't use it without pulling in the whole Web SDK)

    [1] https://github.com/sebastienros/fluid

    [2] https://github.com/chronoxor/NetCoreServer

    (LLM Disclaimer: This project is not vibe-coded. Most of the code is written by hand, with some input from ChatGPT being used as a fancy search engine. The docs are written by hand and then fed through ChatGPT to make them more readable)

  2. ReSharper

    ReSharper is now available in VS Code and Cursor. ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.

    ReSharper logo

  3. WatsonWebserver

    Watson is the fastest, easiest way to build scalable RESTful web servers and services in C#.

    Project mention: Beyond ASP.NET: Lightweight Alternatives for C# Web Development | dev.to | 2025-12-22

    Watson has been around for several years, is part of the .NET Foundation and receives large commits approximately once a year.

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).

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Index

# Project Stars
1 NetCoreServer 3,112
2 WatsonWebserver 498

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