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.

Run xUnit test cases in parallel

C# wrapper around CredWrite/CredRead/CredDelete/CredUIPromptForWindowsCredentials/CredUICmdLinePromptForCredentials functions to store and retrieve from Windows Credential Store

Microsoft.Extension.Logging.ILogger implementation for xunit

A Roslyn analyzer to help migrate from Xunit / NUnit assertions to FluentAssertions

Lots of utility classes

Meziantou.Polyfill generates source-only polyfills for C# features, so runtime-agnostic language capabilities work on older target frameworks.

An in-memory implementation of Microsoft.Extension.Logging.ILogger

Microsoft.Extension.Logging.ILogger implementation for xunit.v3

Allow to declare 'InternalsVisibleTo' in the csproj file, rather than declaring them to an AssemblyInfo.cs file.

FullPath makes it easier to deal with paths

Use FontAwesome in WPF application

Enables verification of objects using inline snapshots

CLI tool to validate NuGet packages follows best-practices

One-way serializer to a human readable format

A package to configure .NET coding style and static analysis

CODEOWNERS file parser

Run xUnit test cases in parallel

Source Generator to generate strongly-typed id with all needed helpers such as converters for System.Text.Json, Newtonsoft.Json, or MongoDB.

TemporaryDirectory allows to create a disposable directory to store temporary files