Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise. Learn more →
Top 23 C# .NET Projects
-
They don't mention it so I don't think it was changed, but I am really looking forward to multiple libraries actually separating the contents.
This <https://github.com/jellyfin/jellyfin/issues/17215> is an example bug; there were others but I can't find them at the moment.
-
Code Effects
Code Effects: AI-Ready .NET Business Rules Engine. Embed visual business rules in your .NET app with AI-assisted authoring, native VS debugging, blazing-fast compiled evaluation, and no SaaS dependency. FREE edition available.
-
Project mention: FastScan VS Files - a user suggested alternative | libhunt.com/r/FastScan | 2026-09-11
Hardware-accelerated, zero-copy systems file scanner for Node.js. Powered by AVX-512/AVX2/NEON SIMD and kernel mmap for ultra-fast log forensics and search.
-
ASP.NET Core
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
.NET's Kestrel is the opposite precedent, and the stable one: after a client disconnect, writes to the response are silently discarded and the documented contract is "observe the RequestAborted cancellation token." That token is exactly what PAGI's pagi.connection object is.
-
Avalonia
Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI
-
-
ILSpy
.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!
-
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 -
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.
-
The public keys and ~/.ssh/config are committed as plain files, the private halves are rendered from Bitwarden at apply time and never touch git. The same mechanism fills in per-machine values — my .chezmoi.toml.tmpl pulls a few cloud subscription IDs from a Bitwarden item so the helper scripts in ~/.local/bin know which subscription to talk to without those IDs living in a public repo.
-
CleanArchitecture
Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10 (by ardalis)
-
Open a built-in type such as int, or Int32, and follow its interfaces upward. You will find INumberBase, which describes an abstract number: an object on which abstract numeric operations can be performed. Surprisingly, the core operations themselves live in separate interfaces.
-
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: MonoGame: A .NET framework for making cross-platform games | news.ycombinator.com | 2026-03-07
-
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.
-
winsw
A wrapper executable that can run any executable as a Windows service, in a permissive license.
-
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: Node.js has plenty of circuit breakers. So why did I build another one? | dev.to | 2026-07-27Java solved this years ago with resilience4j. .NET has Polly. Node.js... has pieces.
-
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.
-
ArchiSteamFarm
C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.
Project mention: ArchiSteamFarm VS steam-game-idler - a user suggested alternative | libhunt.com/r/ArchiSteamFarm | 2026-07-03 -
-
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.
-
Project mention: I needed up-to-date .NET mapper benchmarks. They didn't exist. | dev.to | 2026-06-24
I built a BenchmarkDotNet runner that measures the major .NET mappers across consistent scenarios, plus a small landing page to read the results.
-
-
-
-
AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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
-
Generic Math in C#: The Complete Guide
-
Show HN: K7 – self-hosted media server I built after years on Plex/Jellyfin
-
Jellyfin 12.0 Released
-
AutoHttps: a zero-dependency automatic HTTPS library for ASP.NET Core / Kestrel
-
Show HN: AutoHttps, zero-dependency automatic HTTPS for ASP.NET Core
-
AI Systems Need Runtime Budgets
-
We configured OpenTelemetry logs in Rails
-
A note from our sponsor - AppSignal
www.appsignal.com | 12 Sep 2026
Index
What are some of the best open-source .NET projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Jellyfin | 56,829 |
| 2 | Files | 44,906 |
| 3 | ASP.NET Core | 38,436 |
| 4 | Avalonia | 31,455 |
| 5 | SteamTools | 26,797 |
| 6 | ILSpy | 26,020 |
| 7 | Introducing .NET Multi-platform App UI (MAUI) | 23,321 |
| 8 | Bitwarden | 20,039 |
| 9 | CleanArchitecture | 18,470 |
| 10 | .NET Runtime | 18,268 |
| 11 | OpenRA | 17,344 |
| 12 | MonoGame | 14,395 |
| 13 | ImageGlass | 14,326 |
| 14 | winsw | 14,283 |
| 15 | Polly | 14,235 |
| 16 | modular-monolith-with-ddd | 13,988 |
| 17 | ArchiSteamFarm | 13,681 |
| 18 | ASP.NET Boilerplate | 12,003 |
| 19 | spectre.console | 11,605 |
| 20 | BenchmarkDotNet | 11,492 |
| 21 | Mono | 11,464 |
| 22 | Terminal.Gui | 11,203 |
| 23 | dnSpy | 11,051 |
Sponsored
Code Effects: AI-Ready .NET Business Rules Engine
Embed visual business rules in your .NET app with AI-assisted authoring, native VS debugging, blazing-fast compiled evaluation, and no SaaS dependency. FREE edition available.
codeeffects.com