Magnum by: Chris Patterson, Dru Sellers

Magnum is a library for the larger than average developer

MahApps.Metro by: Jan Karger, Bastian Schmidt, Dennis Daume, Brendan Forster, Alex Mitchell, Paul Jenkins, Jake Ginnivan

The goal of MahApps.Metro is to allow devs to quickly and easily cobble together a 'Modern' UI for their WPF apps (.Net 4.6.2 and later), with minimal effort.

ManagedEsent by: martinc

ManagedEsent provides managed access to ESENT, the embeddable database engine native to Windows. ManagedEsent uses the esent.dll that is part of Microsoft Windows so there are no extra unmanaged binaries to download and install.

MassTransit by: Chris Patterson, Dru Sellers, Travis Smith

MassTransit is a distributed application framework for .NET, including support for MSMQ and RabbitMQ.

MassTransit.Analyzers by: Remco Blok, Chris Patterson

MassTransit provides a developer-focused, modern platform for creating distributed applications without complexity.

MassTransit.AspNetCore by: Chris Patterson

MassTransit AspNetCore Support, including Dashboard; MassTransit provides a developer-focused, modern platform for creating distributed applications without complexity.

MassTransit.RabbitMQ by: Chris Patterson, Dru Sellers, Travis Smith

This integration library adds support for RabbitMQ to MassTransit, a distributed application framework for .NET, including support for MSMQ and RabbitMQ.

MasterMemory by: neuecc

Embedded Readonly In-Memory Document Database for .NET, .NET Core and Unity.

MasterMemory.MSBuild.Tasks by: Cysharp

MSBuild Tasks of MasterMemory Code Generator.

MaterialDesignThemes by: James Willock

ResourceDictionary instances containing Material Design templates and styles for WPF controls in .NET.

MathNet.Filtering by: Christoph Ruegg

Math.NET Filtering with finite and infinite impulse response filter design and application, median filtering and other signal processing methods and algorithms. MIT license. Supports .Net 4.0 and Mono on Windows, Linux and Mac.

MathNet.Numerics 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 4.0, .Net 3.5 and Mono on Windows, Linux and Mac; Silverlight 5, WindowsPhone/SL 8, WindowsPhone 8.1 and Windows 8 with PCL portable profiles 7, 47, 78, 259 and 328; Android/iOS with Xamarin.

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

Math.NET Numerics, signed and thus with a strong name. We strongly discourage using this package and recommend using MathNet.Numerics instead, which is unsigned and weakly named.

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.

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

MemoryPack.Generator by: Cysharp

Code generator for MemoryPack.

MessagePack by: neuecc

Extremely Fast MessagePack(MsgPack) Serializer for C#(.NET, .NET Core, Unity, Xamarin).

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.

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.