MathNet.Numerics.Signed by: Christoph Ruegg, Marcus Cuda, Jurgen Van Gael

Math.NET Numerics is the numerical foundation of the Math.NET project, aiming to provide methods and algorithms for numerical computations in science, engineering and every day use. Supports .NET 5.0 or higher, .NET Standard 2.0 and .NET Framework 4.6.1 or higher, on Windows, Linux and Mac. This package contains strong-named assemblies for legacy use cases (not recommended).

McMaster.Extensions.CommandLineUtils by: Nate McMaster

Command-line parsing API and utilities for console applications. Commonly used types: McMaster.Extensions.CommandLineUtils.CommandLineApplication McMaster.Extensions.CommandLineUtils.CommandOption McMaster.Extensions.CommandLineUtils.IConsole McMaster.Extensions.CommandLineUtils.Prompt McMaster.Extensions.CommandLineUtils.ArgumentEscaper A community-maintained fork of Microsoft.Extensions.CommandLineUtils, plus many enhancements.

MedallionTopologicalSort by: Michael Adelson

A fast implementation of topological sorting that supports stable sorting as well as breaking ties via ThenBy[Descending]

Mediator.Abstractions by: Martin Othamar

Abstractions for the Mediator.SourceGenerator package.

Mediator.SourceGenerator by: Martin Othamar

A high performance .NET Mediator pattern implemenation using source generation.

MediatR by: Jimmy Bogard

Simple, unambitious mediator implementation in .NET

MediatR.Contracts by: Jimmy Bogard

Contracts package for requests, responses, and notifications

MediatR.Extensions.Microsoft.DependencyInjection by: Jimmy Bogard

MediatR extensions for ASP.NET Core

Medo.Uuid7 by: Josip Medved

A library that enables fast generation of version 7 (time-ordered) UUIDs, designed for efficient utilization in databases and resource indexing. It provides conversions to and from GUIDs, multiple string representations, and wide compatibility with .NET 7 and higher, including .NET 4.6.1 and higher (.NET Standard 2.0). Additionally, it supports version 4 (fully random) UUIDs.

MemoryCache.Testing.Moq by: rgvlee

A mocking library that creates Microsoft.Extensions.Caching.Memory IMemoryCache system mocks using Moq.

MemoryPack.Generator by: Cysharp

Code generator for MemoryPack.

MessageBox.Avalonia by: Lary

Messagebox for AvaloniaUI

MessagePack by: neuecc

Extremely fast MessagePack (MsgPack) serializer for C#: source-generated formatters, Native AOT and trimming support, zero-copy buffers on .NET 9+, and wire compatibility with MessagePack for C# v3. Supports .NET Framework (netstandard2.0), .NET 9+ and Unity.

MessagePack.Annotations by: neuecc

Migration shim for MessagePack v3 code: the attributes now live in the MessagePack package and this package type-forwards to it. Reference MessagePack directly in new projects.

MessagePackAnalyzer by: neuecc, aarnott

Analyzers and source generator for MessagePack for C#. Verify rules for [MessagePackObject] and code fix for [Key]. A roslyn source generator for AOT or faster startup of applications that use the MessagePack nuget package.

MetadataReferenceService.Abstractions by: Stef Heyenrath

This package defines the IMetadataReferenceService interface.

MetadataReferenceService.Default by: Stef Heyenrath

Use this package to generate a MetadataReference based on an Assembly location or Assembly image.

Meziantou.Analyzer by: meziantou

A powerful C# Roslyn analyzer that uses static analysis to detect bugs, surface security issues, and enforce best practices—helping developers and AI write more reliable code.

MicroCom.CodeGenerator.MSBuild by: MicroCom.CodeGenerator.MSBuild

IDL-based COM interop codegen. Consumes MIDL-like IDL file, generates efficient cross-platform C# interop and C++ header files.

MicroCom.Runtime by: MicroCom.Runtime

IDL-based COM interop codegen. Consumes MIDL-like IDL file, generates efficient cross-platform C# interop and C++ header files.