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Top 23 C# .NET Projects
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Are you talking about the Jellyfin server? It is quite an active project. Last release was 10.11.8 about a month ago, and github says that there have been 1049 commits to master since then.
https://github.com/jellyfin/jellyfin/releases/tag/v10.11.8
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Project mention: My PC Cries Every Morning, But These 8 Startup Apps Are Worth It | dev.to | 2025-11-12
Files: File Explorer's Cooler, Younger Sibling
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ASP.NET Core
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
Project mention: Accept the Official Hack - Build-Time OpenAPI Detection in .NET 10 Minimal APIs | dev.to | 2026-05-30GetDocument.Insider.dll is the command line tool that automatically runs during build of the API if the .csproj includes the following reference:
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Avalonia
Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI
> I like WASM and I want to like WASM but the rate of maturity within the ecosystem is incredibly abysmal.
The C# toolchain for WebAssembly is pretty good. You can do a lot with Avalonia and Uno:
https://avaloniaui.net/
https://platform.uno/
Here's a C# clone of Visual Basic compiled to WebAssembly:
https://bandysc.github.io/AvaloniaVisualBasic6/
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ILSpy
.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!
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Introducing .NET Multi-platform App UI (MAUI)
.NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop.
Project mention: Ask HN: What Is the State of App Development in 2026? | news.ycombinator.com | 2026-05-30 -
SaaSHub
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Project mention: NodeWarden: Bitwarden on Cloudflare Workers — No Server Required | dev.to | 2026-04-07
Bitwarden Official Website
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CleanArchitecture
Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10 (by ardalis)
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Then double click on the "complex-app" process and we'll see what is really consuming time in our program. And the winner is the coreclr! That's expected, the Core Language Runtime will definitely be doing most of the heavy lifting of our app, in my case representing 36% of total execution time.
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OpenRA
Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL. Runs on Windows, Linux, *BSD and Mac OS X.
Project mention: Ask HN: Which Do you know any open source games? | news.ycombinator.com | 2025-08-10 -
Polly
Polly is a .NET resilience and transient-fault-handling library that allows developers to express policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent and thread-safe manner. From version 6.0.1, Polly targets .NET Standard 1.1 and 2.0+.
Project mention: Cómo manejar fallos transitorios en .NET con Polly y ResiliencePipelineBuilder | dev.to | 2026-04-27Polly - repositorio oficial
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winsw
A wrapper executable that can run any executable as a Windows service, in a permissive license.
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Project mention: MonoGame: A .NET framework for making cross-platform games | news.ycombinator.com | 2026-03-07
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Project mention: I Curated 106 Software Design Resources and Ranked What Actually Matters | dev.to | 2026-02-12
kgrzybek/modular-monolith-with-ddd — The most complete Modular Monolith example I've seen. C#, but the patterns are universal.
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ArchiSteamFarm
C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.
Project mention: Exploring the tragedy of the Counter-Strike 2 server browser | news.ycombinator.com | 2025-08-25I'd heard of https://github.com/JustArchiNET/ArchiSteamFarm for Steam cards but not CS2 drops.
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ImageGlass
🏞 A fast, open-source, modern image viewer for 90+ formats – including WEBP, GIF, SVG, AVIF, JXL, HEIC and more – built for smooth browsing across Windows, macOS, and Linux.
Project mention: .NET 10 Preview 6 brings JIT improvements, one-shot tool execution | news.ycombinator.com | 2025-07-30 -
I wanted to find a framework that already had all the Boiler code needed for a business application: menus, sections, graphs, users, etc. While searching for such a framework, we noticed the .Net frameworks https://aspnetboilerplate.com and https://abp.io, which already have a lot of things "out of the box". As far as I understand, both frameworks are being developed either by related teams, or even by one team. And the teams are from Turkey. The ASP.NET Boilerplate framework has legacy code from older versions of the .Net Framework. The newer ABP framework does not have legacy, it is on .Net Core. Both frameworks have a decent number of stars on github.
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First, check out the following thread in its entirety, which is what AI might form a response from. Now let's explore a better way using Spectre.Console NuGet package.
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Project mention: Testable Dotfiles Management: Building Development Environment with Chezmoi | dev.to | 2025-10-06
Benchmark.Net for .Net projects
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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).
C# .NET discussion
C# .NET related posts
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docfx-remote-include: inline remote markdown into DocFX, and govern the assembled page
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Why CRUD Is Not Enough for Serious Business Apps
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Fizzy: Desktop app built almost in Zig (DVUI)
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Accept the Official Hack - Build-Time OpenAPI Detection in .NET 10 Minimal APIs
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Introduction to LiquidPages
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Aspire – orchestrate front ends, APIs, containers, and databases
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.NET (OK, C#) gets union types
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A note from our sponsor - ReSharper
www.jetbrains.com | 10 Jun 2026
Index
What are some of the best open-source .NET projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Jellyfin | 53,098 |
| 2 | Files | 43,798 |
| 3 | ASP.NET Core | 37,962 |
| 4 | Avalonia | 30,928 |
| 5 | SteamTools | 25,687 |
| 6 | ILSpy | 25,354 |
| 7 | Introducing .NET Multi-platform App UI (MAUI) | 23,268 |
| 8 | Bitwarden | 19,095 |
| 9 | CleanArchitecture | 18,254 |
| 10 | .NET Runtime | 17,928 |
| 11 | OpenRA | 16,768 |
| 12 | Polly | 14,182 |
| 13 | winsw | 14,020 |
| 14 | MonoGame | 13,976 |
| 15 | modular-monolith-with-ddd | 13,701 |
| 16 | ArchiSteamFarm | 13,357 |
| 17 | ImageGlass | 13,304 |
| 18 | ASP.NET Boilerplate | 11,981 |
| 19 | spectre.console | 11,482 |
| 20 | Mono | 11,440 |
| 21 | BenchmarkDotNet | 11,421 |
| 22 | Terminal.Gui | 11,043 |
| 23 | Orleans | 10,787 |
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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.
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