Best Open Source dotnet Libraries

A curated list of the most popular GitHub repositories tagged with dotnet. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.

#1jellyfin/jellyfin

The Free Software Media System - Server Backend & API

48,708C#

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#2files-community/Files

A modern file manager that helps users organize their files and folders.

42,035C#

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#3dotnet/aspnetcore

ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.

37,726C#

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#4SeleniumHQ/selenium

A browser automation framework and ecosystem.

34,064Java

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#5AvaloniaUI/Avalonia

Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The most popular .NET UI client technology

30,094C#

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#6pulumi/pulumi

Pulumi - Infrastructure as Code in any programming language 🚀

24,802Go

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#7icsharpcode/ILSpy

.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!

24,623C#

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#8BeyondDimension/SteamTools

🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。

24,499C#

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#9dotnet/maui

.NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop.

23,181C#

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#10dotnet/core

.NET news, announcements, release notes, and more!

21,898PowerShell

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#11quozd/awesome-dotnet

A collection of awesome .NET libraries, tools, frameworks and software

21,116

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#12MoienTajik/AspNetCore-Developer-Roadmap

Roadmap to becoming an ASP.NET Core developer in 2026

19,537

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#13bitwarden/server

Bitwarden infrastructure/backend (API, database, Docker, etc).

18,082C#

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#14ardalis/CleanArchitecture

Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10

18,008C#

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#15dotnet/runtime

.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.

17,691C#

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#16dotnet/corefx

This repo is used for servicing PR's for .NET Core 2.1 and 3.1. Please visit us at https://github.com/dotnet/runtime

17,534

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#17App-vNext/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+.

14,134C#

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#18winsw/winsw

A wrapper executable that can run any executable as a Windows service, in a permissive license.

13,704C#

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#19kgrzybek/modular-monolith-with-ddd

Full Modular Monolith application with Domain-Driven Design approach.

13,392C#

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#20MonoGame/MonoGame

One framework for creating powerful cross-platform games.

13,182C#

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#21JustArchiNET/ArchiSteamFarm

C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.

13,081C#

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#22dotnet/coreclr

CoreCLR is the runtime for .NET Core. It includes the garbage collector, JIT compiler, primitive data types and low-level classes.

12,777

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#23d2phap/ImageGlass

🏞 A lightweight, versatile image viewer

12,247C#

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#24docker-archive-public/docker.labs

This is a collection of tutorials for learning how to use Docker with various tools. Contributions welcome.

12,148PHP

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#25nopSolutions/nopCommerce

ASP.NET Core eCommerce software. nopCommerce is a free and open-source shopping cart.

9,983C#

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#26unoplatform/uno

Open-source platform for building cross-platform native Mobile, Web, Desktop and Embedded apps quickly. Create rich, C#/XAML, single-codebase apps from any IDE. Hot Reload included! 90m+ NuGet Downloads!!

9,830C#

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#27quasar/Quasar

Remote Administration Tool for Windows

9,726C#

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#28studyzy/imewlconverter

”深蓝词库转换“ 一款开源免费的输入法词库转换程序

9,686C#

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#29egametang/ET

Unity3D Client And C# Server Framework

9,672C#

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#30bchavez/Bogus

:card_index: A simple fake data generator for C#, F#, and VB.NET. Based on and ported from the famed faker.js.

9,610C#

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#31reactiveui/refit

The automatic type-safe REST library for .NET Core, Xamarin and .NET. Heavily inspired by Square's Retrofit library, Refit turns your REST API into a live interface.

9,397C#

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#32litedb-org/LiteDB

LiteDB - A .NET NoSQL Document Store in a single data file

9,342C#

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#33dotnet/machinelearning

ML.NET is an open source and cross-platform machine learning framework for .NET.

9,326C#

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#34lepoco/wpfui

WPF UI provides the Fluent experience in your known and loved WPF framework. Intuitive design, themes, navigation and new immersive controls. All natively and effortlessly.

9,151C#

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#35ThreeMammals/Ocelot

.NET API Gateway

8,693C#

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#36quartznet/quartznet

Quartz Enterprise Scheduler .NET

6,997C#

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#37Elfocrash/.NET-Backend-Developer-Roadmap

Roadmap for a .NET Backend Developer working with Microservices

6,834

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#38NLog/NLog

NLog - Flexible and Structured Logging for various .NET Platforms

6,537C#

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