.NET

MartenJasperFx/marten

A .NET library that uses PostgreSQL as a transactional document database and ACID-compliant event store.

Shouldlyshouldly/shouldly

A .NET assertion framework that provides clear, human-readable error messages for unit tests.

CppSharpmono/CppSharp

Tools and libraries to generate .NET bindings for native C/C++ APIs, enabling interoperability with C# and C++/CLI.

FluentFTProbinrodricks/FluentFTP

A fully managed, high-performance FTP and FTPS client library for .NET and .NET Standard, optimized for speed.

FluentFTProbinrodricks/FluentFTP

A fully managed, high-performance FTP and FTPS client library for .NET and .NET Standard, optimized for speed.

LINQ to DBlinq2db/linq2db

A fast, type-safe LINQ database access library that sits between micro-ORMs and full ORMs, offering SQL-like control with LINQ expressions.

mongo-csharp-drivermongodb/mongo-csharp-driver

The official MongoDB .NET/C# driver for connecting C# applications to MongoDB databases.

aspnet-api-versioningMicrosoft/aspnet-api-versioning

A set of libraries for adding API versioning semantics to ASP.NET Web API, OData, and ASP.NET Core services.

.NET Interactivedotnet/interactive

An engine and API for running .NET and other languages interactively in notebooks, REPLs, and embedded coding experiences.

CosmosOSCosmosOS/Cosmos

An operating system construction kit for building bare-metal OSes using managed .NET languages like C# and VB.NET.

NetMQzeromq/netmq

A 100% native C# implementation of the ZeroMQ messaging library for .NET applications.

coverlettonerdo/coverlet

A cross-platform code coverage collection tool for .NET, supporting line, branch, and method coverage.

TensorFlowSharpmigueldeicaza/TensorFlowSharp

A .NET binding to the TensorFlow C API for running existing machine learning models in C# and F#.

ComputeSharpSergio0694/ComputeSharp

A .NET library to run C# code in parallel on the GPU through DX12 and D2D1, generating HLSL shaders dynamically.

GitVersionGitTools/GitVersion

Automatically determines semantic version numbers from your git history and branch structure.

NetHook2SteamRE/SteamKit

A .NET library for interoperating with Valve's Steam network, providing a simple and extensible interface.

SteamKit2SteamRE/SteamKit

A .NET library for interoperating with Valve's Steam network, providing a simple and extensible interface.

ZXing.Netmicjahn/ZXing.Net

A .NET port of the ZXing library for decoding and generating barcodes like QR codes, Data Matrix, and EAN.

FlaUIFlaUI/FlaUI

A .NET library for automated UI testing of Windows applications using Microsoft's UI Automation framework.

EasyNetQEasyNetQ/EasyNetQ

A simple and intuitive .NET API wrapper for RabbitMQ messaging.

MaterialSkinIgnaceMaes/MaterialSkin

A .NET WinForms library that applies Google's Material Design principles to desktop applications.

NodaTimenodatime/nodatime

A better date and time API for .NET, designed for clarity and precision in handling temporal data.

Mono.Ceciljbevain/cecil

A library to inspect, modify, and create .NET programs and libraries at the CIL level without loading assemblies.

playwright-dotnetmicrosoft/playwright-dotnet

Official .NET library for cross-browser web automation and testing with Chromium, Firefox, and WebKit.

Pomelo.EntityFrameworkCore.MySqlPomeloFoundation/Pomelo.EntityFrameworkCore.MySql

The most popular Entity Framework Core provider for MySQL and MariaDB, built on top of MySqlConnector for high-performance database communication.

NSubstitutensubstitute/NSubstitute

A friendly .NET mocking library with a succinct syntax that keeps tests focused on intention rather than configuration.

RESTlermicrosoft/restler-fuzzer

A stateful REST API fuzzing tool that automatically tests cloud services to find security and reliability bugs.

Demystifierbenaadams/Ben.Demystifier

A .NET library that transforms cryptic stack traces into human-readable C# source code format for faster debugging.

Caliburn.MicroCaliburn-Micro/Caliburn.Micro

A small, powerful framework for building XAML applications with strong MVVM support across multiple platforms.

MatBlazorSamProf/MatBlazor

A comprehensive library of Material Design UI components for building Blazor and Razor Components applications.

YamlDotNetaaubry/YamlDotNet

A .NET library for parsing, emitting, and serializing YAML with support for YAML 1.1 and 1.2 specifications.

CSharpFunctionalExtensionsvkhorikov/CSharpFunctionalExtensions

A C# library providing functional programming constructs like Result and Maybe types to write more robust and expressive code.

RoslynPadaelij/RoslynPad

A cross-platform C# editor and REPL built on Roslyn for real-time code execution and analysis.

FluentSchedulerfluentscheduler/FluentScheduler

A .NET job scheduler with a fluent interface for scheduling automated tasks.

BlzhawkTASEmulators/BizHawk

A multi-system emulator with advanced recording, debugging, and tool-assisted speedrunning (TAS) features.

Veldridmellinoe/veldrid

A cross-platform, graphics API-agnostic rendering and compute library for .NET, providing a unified GPU interface.