.NET Standard

PollyApp-vNext/Polly

A .NET resilience and transient-fault-handling library for expressing policies like Retry, Circuit Breaker, and Timeout in a fluent, thread-safe manner.

Orleansdotnet/orleans

A cross-platform framework for building robust, scalable distributed applications in .NET using the virtual actor model.

Bogusbchavez/Bogus

A simple fake data generator for C#, F#, and VB.NET, ported from faker.js, to load databases and apps with realistic test data.

PrismPrismLibrary/Prism

A framework for building loosely coupled, maintainable, and testable XAML applications across WPF, Avalonia, MAUI, and Uno Platform.

Workflow Coredanielgerlag/workflow-core

A lightweight, embeddable workflow engine for .NET Standard, designed for long-running processes with state tracking.

SkiaSharpmono/SkiaSharp

A cross-platform 2D graphics API for .NET, providing comprehensive rendering capabilities across mobile, server, and desktop.

QRCoder Wcodebude/QRCoder

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

protobuf-netmgravell/protobuf-net

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

Command Line Parsercommandlineparser/commandline

A robust C#/.NET command line parser library with *nix getopt style, supporting F# and verb commands.

ExcelDataReaderExcelDataReader/ExcelDataReader

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

SSH.NETsshnet/SSH.NET

A Secure Shell (SSH-2) library for .NET, optimized for parallelism.

Testcontainerstestcontainers/testcontainers-dotnet

A .NET library for creating disposable Docker containers to support integration and end-to-end testing.

Fluent Assertionsfluentassertions/fluentassertions

A comprehensive set of extension methods for writing readable and intuitive assertions in .NET unit tests.

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.

BruteSharkodedshimon/BruteShark

A Network Forensic Analysis Tool (NFAT) for deep inspection of PCAP files and live traffic, extracting credentials, building network maps, and reconstructing sessions.

UnitsNetangularsen/UnitsNet

A .NET library providing strongly typed units of measurement for safer and more readable code.

Octokit.NEToctokit/octokit.net

A .NET client library for interacting with the GitHub API, supporting .NET Framework 4.6+ and .NET Standard 2.0+.

Iron PythonIronLanguages/ironpython3

An open-source implementation of Python 3.x for the .NET Framework, built on the Dynamic Language Runtime.

Akavachereactiveui/Akavache

An asynchronous, persistent key-value store for .NET desktop and mobile applications, based on SQLite3.

RabbitMQ.NETrabbitmq/rabbitmq-dotnet-client

Official .NET client library for RabbitMQ, enabling .NET applications to communicate with RabbitMQ message brokers.

pinvokedotnet/pinvoke

A comprehensive collection of P/Invoke method signatures for Windows APIs, packaged as NuGet libraries with type-safe wrappers.

MimeKitjstedfast/MimeKit

A high-performance .NET library for creating and parsing MIME messages with support for S/MIME, PGP, DKIM, TNEF, and Unix mbox.

AspectCore Frameworkdotnetcore/AspectCore-Framework

An Aspect-Oriented Programming (AOP) framework for .NET Core and .NET Framework with cross-platform support.

System.Linq.Dynamic.CoreStefH/System.Linq.Dynamic.Core

A .NET library for writing dynamic LINQ queries using string expressions, supporting .NET Core, .NET Standard, and .NET Framework.

Castle.Windsorcastleproject/Windsor

A mature, feature-rich Inversion of Control container for .NET applications.