Top 20 NuGet mock Packages

Lightweight StandAlone Http Mocking Server for .Net.
Lightweight Http Mocking Server for .Net, inspired by WireMock from the Java landscape.
ServiceFabric.Mocks contains many mocks and helper classes to facilitate and simplify unit testing of your Service Fabric Actor and Service projects.
Utilities to streamline unit testing in Dynamics CRM 365 by faking the IOrganizationService against an In-Memory context which runs blazing fast.
The most powerful free mocking library available for .NET developers.
A library to help with unit/accpetance tests of code that relies on an external HTTP service, by allowing you to easily mock one.
Utilities to streamline unit testing in Dynamics CRM 365 by faking the IOrganizationService against an In-Memory context which runs blazing fast.
Supports checking that Moq setups are executed in sequence.
Testing layer for Microsoft's HttpClient library
Extension for mocking Entity Framework Core operations such ToListAsync, FirstOrDefaultAsync etc. by Moq When writing tests for your application it is often desirable to avoid hitting the database. The extension allows you to achieve this by creating a context – with behavior defined by your tests –...
Async operations with generic collections, to provide for collections such List<T> execute EntityFrameworkCore operations such ToListAsync, FirstOrDefaultAsync etc.
AltV .NET Core Server Mock Api
Utilities to streamline unit testing in Dynamics CRM 2016 by faking the IOrganizationService against an In-Memory context which runs blazingly fast.
Mocklis is a library and source code generator for .net, targeted at generating test doubles from interfaces. This package contains tools for writing tests using the generated code.
A light abstraction around Dapper and Dapper.Contrib that also maintains the behavior IDbConnection. This library facilitates a loosely coupled design and unit testing.
Utilities to streamline unit testing in Dynamics CRM 2011 by faking the IOrganizationService against an In-Memory context which runs blazingly fast.
Utilities to streamline unit testing in Dynamics CRM 2015 by faking the IOrganizationService against an In-Memory context which runs blazingly fast.
Utilities to streamline unit testing in Dynamics CRM 2013 by faking the IOrganizationService against an In-Memory context which runs blazingly fast.
Moq auto mocking integration for Stashbox.
An abstract/virtual filesystem framework with many built-ins filesystems for .NET