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

49,396C#

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#2files-community/Files

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

42,434C#

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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.

37,776C#

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#4SeleniumHQ/selenium

A browser automation framework and ecosystem.

34,130Java

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#5AvaloniaUI/Avalonia

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

30,270C#

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#6pulumi/pulumi

Pulumi - Infrastructure as Code in any programming language 🚀

24,932Go

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#7BeyondDimension/SteamTools

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

24,784C#

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#8icsharpcode/ILSpy

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

24,769C#

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#9jasontaylordev/CleanArchitecture

Clean Architecture Solution Template for ASP.NET Core

19,795Bicep

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#10MoienTajik/AspNetCore-Developer-Roadmap

Roadmap to becoming an ASP.NET Core developer in 2026

19,549

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#11bitwarden/server

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

18,274C#

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#12ardalis/CleanArchitecture

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

18,082C#

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#13dotnet/runtime

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

17,750C#

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#14microsoft/react-native-windows

A framework for building native Windows apps with React.

17,204C++

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#15OpenRA/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.

16,521C#

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#16amplication/amplication

Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows that drive consistency, enable high-quality code practices, simplify onboarding, and accelerate standardized delivery across teams.

16,003TypeScript

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#17microsoft/agent-framework

A framework for building, orchestrating and deploying AI agents and multi-agent workflows with support for Python and .NET.

14,200Python

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#18nopSolutions/nopCommerce

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

10,161C#

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#19unoplatform/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!!

9,855C#

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#20studyzy/imewlconverter

”深蓝词库转换“ 一款开源免费的输入法词库转换程序

9,750C#

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#21egametang/ET

Unity3D Client And C# Server Framework

9,704C#

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#22bchavez/Bogus

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

9,628C#

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#23reactiveui/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.

9,436C#

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#24litedb-org/LiteDB

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

9,360C#

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#25dotnet/machinelearning

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

9,329C#

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#26lepoco/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.

9,226C#

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#27ThreeMammals/Ocelot

.NET API Gateway

8,695C#

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#28quartznet/quartznet

Quartz Enterprise Scheduler .NET

7,096C#

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#29shimat/opencvsharp

OpenCV wrapper for .NET

6,114C#

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#30Azure/azure-sdk-for-net

This repository is for active development of the Azure SDK for .NET. For consumers of the SDK we recommend visiting our public developer docs at https://learn.microsoft.com/dotnet/azure/ or our versioned developer docs at https://azure.github.io/azure-sdk-for-net.

6,068C#

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#31KnifeLemon/Filee

Free, open-source file converter. Convert 180+ formats offline by drag & drop — images, PDF, Word, Excel, PowerPoint, HWP/HWPX, video, audio, e-books and archives. No upload, no Office needed.

5,063C#

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