Best Open Source csharp Libraries
A curated list of the most popular GitHub repositories tagged with csharp. 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
#2files-community/Files
A modern file manager that helps users organize their files and folders.
#3ShareX/ShareX
ShareX is a free and open-source application that enables users to capture or record any area of their screen with a single keystroke. It also supports uploading images, text, and various file types to a wide range of destinations.
#4doocs/leetcode
🔥LeetCode solutions in any programming language | 多种编程语言实现 LeetCode、《剑指 Offer（第 2 版）》、《程序员面试金典（第 6 版）》题解
#5DevToys-app/DevToys
A Swiss Army knife for developers.
#6microsoft/calculator
Windows Calculator: A simple yet powerful calculator that ships with Windows
#7AvaloniaUI/Avalonia
Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The most popular .NET UI client technology
#8pulumi/pulumi
Pulumi - Infrastructure as Code in any programming language 🚀
#9mxgmn/WaveFunctionCollapse
Bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics
#10BeyondDimension/SteamTools
🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。
#11MoienTajik/AspNetCore-Developer-Roadmap
Roadmap to becoming an ASP.NET Core developer in 2026
#12peass-ng/PEASS-ng
PEASS - Privilege Escalation Awesome Scripts SUITE (with colors)
#13antlr/antlr4
ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.
#14rocksdanister/lively
Free and open-source software that allows users to set animated desktop wallpapers and screensavers powered by WinUI 3.
#15bitwarden/server
Bitwarden infrastructure/backend (API, database, Docker, etc).
#16ardalis/CleanArchitecture
Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10
#17OpenRA/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.
#18amplication/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.
#19arthurspk/guiadevbrasil
Um guia extenso de informações com um vasto conteúdo de várias áreas para ajudar, agregar conhecimento e retirar dúvidas, nesse guia você encontrará tudo que necessário para qualquer carreira relacionada a tecnologia.
#20microsoft/mcp-for-beginners
This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .NET, Java, TypeScript, JavaScript, Rust and Python. Designed for developers, it focuses on practical techniques for building modular, scalable, and secure AI workflows from session setup to service orchestration.
#21unoplatform/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!!
#22bchavez/Bogus
:card_index: A simple fake data generator for C#, F#, and VB.NET. Based on and ported from the famed faker.js.
#23AdrienTorris/awesome-blazor
Resources for Blazor, a .NET web framework using C#/Razor and HTML that runs in the browser with WebAssembly.
#24lepoco/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.
#25AutoDarkMode/Windows-Auto-Night-Mode
Automatically switches between the dark and light theme of Windows 10 and Windows 11
#26xberg-io/xberg
A polyglot document intelligence framework with a Rust core. Extract text, metadata, images, and structured information from PDFs, Office documents, images, and 97+ formats. Available for Rust, Python, Ruby, Java, Go, PHP, Elixir, C#, R, C, TypeScript (Node/Bun/Wasm/Deno)- or use via CLI, REST API, or MCP server.
#27dotnet/Silk.NET
The high-speed OpenGL, OpenCL, OpenAL, OpenXR, GLFW, SDL, Vulkan, Assimp, WebGPU, and DirectX bindings library your mother warned you about.
#28dotnet/MQTTnet
MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker). The implementation is based on the documentation from http://mqtt.org/.
#29Planshit/Tai
👻 在Windows上统计软件使用时长和网站浏览时长
#30Kinnara/ModernWpf
Modern styles and controls for your WPF applications
#31Azure/autorest
OpenAPI (f.k.a Swagger) Specification code generator. Supports C#, PowerShell, Go, Java, Node.js, TypeScript, Python
#32kwsch/PKHeX
Pokémon Save File Editor
#33radzenhq/radzen-blazor
Radzen Blazor is the most sophisticated free UI component library for Blazor, featuring 145+ native components including DataGrid, Scheduler, Charts, and advanced theming with full support for Material Design and Fluent UI. If Radzen Blazor is useful to you, a ⭐ on GitHub helps other Blazor developers find it.
#34dotnet/macios
.NET for iOS, Mac Catalyst, macOS, and tvOS provide open-source bindings of the Apple SDKs for use with .NET managed languages such as C#
#35vpnhood/VpnHood
Undetectable, Fast, Cross-Platform, Free VPN
#36Kindness-Kismet/stelliberty
Stelliberty Remake，高性能且美观的现代跨平台网络客户端
#37EntityGraphQL/EntityGraphQL
A GraphQL library for .NET
#38ptr727/PlexCleaner
Utility to optimize media files for Direct Play in Plex, Emby, Jellyfin, etc.
#39pnp/pnpframework
PnP Framework is a .NET library targeting Microsoft 365 containing the PnP Provisioning engine and a ton of other useful extensions
#40godot-gdunit-labs/gdUnit4Net
Official C# implementation of GDUnit4 - a comprehensive unit testing framework for Godot 4. Features VS/Rider test adapter integration, parameterized tests, scene runners, and extensive assertion methods.
#41no-faff/InstallerClean
Open source tool to safely clean orphaned Windows Installer files and reclaim disk space
#42InkCanvasForClass/community
InkCanvasForClass Community Open Source Project