Top 20 NuGet Unit Testing Packages

Build tasks and targets for running tests with Test Platform
Storyteller Project Runner and Editor
Interface that allows Internal Navigation Testing for Behaviour Driven Development Test Library for Xamarin.Forms
My Tested ASP.NET Core MVC common abstractions and interfaces.
A Dapplo.Log XUnit logger
Provides a base class for tests based on Microsoft.Extensions.DependencyInjection. Use common Startup.cs patterns like ConfigureConfiguration(...), ConfigureServices(...) and Configure(...) to setup your tests.
Run XUnit tests in a remote process
SpecFlow generator plugin that adds ability to retry tests on failure for MSTest/NUnit.
You will be able to manipulate Infragistics Xam Controls. This library is built on Friendly Layer.
Package Description
NTestDataBuilder has been renamed to TestStack.Dossier.
Appender for NLog to report log messages into ReportPortal
Appender for Log4Net to report log messages into ReportPortal
MvcRouteTester is a .Net library to help unit testing ASP MVC route tables. It contains asserts for for both regular controllers and the Api controllers that are new in MVC 4.0. It is built in .Net 4.5 and ASP MVC 5.2.3. See the project page for packages for ASP MVC 51, 5.0 and ASP MVC 4.0
Unit testing framework for Sitecore.
Experiment.AutoFixture supports auto data using AutoFixture library in parameterized tests.
A light abstraction around Dapper and Dapper.Contrib that also maintains the behavior IDbConnection. This library facilitates a loosely coupled design and unit testing.
Abbotware Interop Library for NUnit - Contains helper methods, extension methods, and plugins
Ghpr.LocalFileSystem: Data provider package to work with local files
Provides LightBDD integration with Microsoft.Extensions.DependencyInjection, allowing to use Microsoft DI compatible container for LightBDD scenarios.