.NET

OpenCvSharpshimat/opencvsharp

A cross-platform .NET wrapper for OpenCV, providing image processing and computer vision functionality for .NET applications.

GraphQL.NETgraphql-dotnet/graphql-dotnet

A .NET implementation of the GraphQL specification for building GraphQL APIs and servers.

SqlSugarDotNetNext/SqlSugar

A high-performance, multi-database compatible .NET ORM framework with low-code features and enterprise-ready solutions.

HotChocolateChilliCream/hotchocolate

A comprehensive open-source GraphQL platform for .NET, featuring a server, client, IDE, and DataLoader.

ClosedXMLClosedXML/ClosedXML

A .NET library for reading, manipulating, and writing Excel 2007+ files with an intuitive API.

Xamarin.Formsxamarin/Xamarin.Forms

A cross-platform UI toolkit for building native iOS, Android, Windows, and macOS apps with C# and .NET.

msbuildMicrosoft/msbuild

The Microsoft Build Engine (MSBuild) is the open-source build platform for .NET and Visual Studio applications.

MSBuilddotnet/msbuild

The Microsoft Build Engine (MSBuild) is the XML-based build platform for .NET and Visual Studio applications.

ServiceStackServiceStack/ServiceStack

A simple, fast, versatile, and highly-productive full-featured web services framework for .NET with a message-based design.

ServiceStack.OrmLiteServiceStack/ServiceStack

A simple, fast, versatile, and highly-productive full-featured web services framework for .NET with a message-based design.

LiveCharts2beto-rodriguez/LiveCharts2

A cross-platform .NET charting library for creating interactive charts, maps, and gauges across multiple UI frameworks.

markdiglunet-io/markdig

A fast, powerful, CommonMark compliant, and extensible Markdown processor for .NET.

OpenIddictopeniddict/openiddict-core

A flexible and versatile OAuth 2.0/OpenID Connect stack for implementing client, server, and token validation in .NET applications.

MapsterMapsterMapper/Mapster

A high-performance, developer-friendly object-to-object mapper for .NET that automates mapping code generation.

QRCoder Wcodebude/QRCoder

A pure C# library for generating QR codes and Micro QR codes with multiple output formats and 23+ payload generators.

MQTTnetchkr1011/MQTTnet

A high-performance .NET library providing MQTT client and server (broker) implementations, supporting MQTT protocol up to version 5.

MQTTNetdotnet/MQTTnet

A high-performance .NET library providing MQTT client and server (broker) implementations supporting MQTT protocol up to version 5.

protobuf-netmgravell/protobuf-net

A contract-based Protocol Buffers serializer for .NET with idiomatic API patterns similar to XmlSerializer.

Protobuf.NETprotobuf-net/protobuf-net

A contract-based Protocol Buffers serializer for .NET that follows idiomatic .NET patterns like XmlSerializer.

BootstrapBlazordotnetcore/BootstrapBlazor

An enterprise-level UI component library for building modern web applications with Bootstrap styling and Blazor.

FAST Blazormicrosoft/fast-blazor

A Blazor component library implementing Microsoft's Fluent Design System for building modern web applications.

Scalable sentiment analysisdotnet/machinelearning-samples

A collection of samples demonstrating how to use ML.NET for various machine learning tasks in .NET applications.

Autofacautofac/Autofac

An Inversion of Control (IoC) container for .NET that manages dependencies between classes to keep applications maintainable as they scale.

Cyberduckiterate-ch/cyberduck

A libre file transfer client for macOS and Windows supporting FTP, SFTP, WebDAV, Amazon S3, Azure, OneDrive, and more.

xUnit.netxunit/xunit

A free, open source, community-focused unit testing tool for C#, F#, and Visual Basic .NET applications.

Open-XML-SDKOfficeDev/Open-XML-SDK

A .NET framework for programmatically creating, reading, and editing Microsoft Office Word, Excel, and PowerPoint documents.

Open XML SDKofficedev/open-xml-sdk

A .NET framework for low-level programmatic creation and manipulation of Word, Excel, and PowerPoint documents using the Open XML standard.

Accordaccord-net/framework

A comprehensive .NET framework for machine learning, computer vision, statistics, and scientific computing.

MagicOnionneuecc/MagicOnion

A modern RPC framework for .NET and Unity that provides unified real-time communication and API services using gRPC.

Flurltmenier/Flurl

A fluent URL builder and testable HTTP client library for .NET with a modern, asynchronous API.

ExcelDataReaderExcelDataReader/ExcelDataReader

A lightweight and fast C# library for reading Microsoft Excel files (including .xls, .xlsx, .xlsb, and .csv) from .NET applications.

PushSharpRedth/PushSharp

A server-side .NET library for sending push notifications to iOS (APNS), Android (GCM/FCM), Windows (WNS), Amazon (ADM), and Blackberry devices.

PSReadLinelzybkr/PSReadLine

A bash-inspired readline implementation that enhances PowerShell's command line editing with syntax coloring, history search, and customizable key bindings.

F# main repositorydotnet/fsharp

The official repository for the F# compiler, core library, language service, and Visual Studio tooling.

Scrutorkhellang/Scrutor

Assembly scanning and decoration extensions for Microsoft.Extensions.DependencyInjection in .NET applications.

Coraveljamesmh/coravel

A near-zero config .NET library for task scheduling, queuing, caching, event broadcasting, and mailing with simple, expressive syntax.