Rhino Mocks is using Castle Dynamic Proxy (http://www.castleproject.org/dynamicproxy/index.html) to handle proxying the types it needs to mock. The Dynamic Proxy project has been invaluable resource and made creating Rhino Mocks possible.

The simplest mocking library for .NET 3.5/4.0 and Silverlight with deep C# 3.0 integration.

NUnit.Mocks was originally developed for internal use in NUnit's own tests, although we no longer use it for that purpose. In addition, it has been useful as a teaching tool, allowing users to gain familiarity with mocking techniques before moving on to more serious frameworks. For production use, we recommend you install a full-featured mock obj... More information

NSubstitute is a friendly substitute for .NET mocking frameworks. It has a simple, succinct syntax to help developers write clearer tests. NSubstitute is designed for Arrange-Act-Assert (AAA) testing and with Test Driven Development (TDD) in mind.

Machine.Fakes attempts to simplify the usage of such frameworks on top of Machine.Specifications by helping to reduce a lot of the typical fake framwork related clutter code in specifications. If you choose so, Machine.Fakes even helps you to stay mostly independent of a concrete fake framework by providing a little wrapper API and a provider model... More information

It's faking amazing! The easy mocking framework for .NET that works great in C# and VB.NET alike. No need to know the difference between a stub, a mock or a spy, everything's a fake! The easy to use, refactoring friendly API makes faking a breeze.

This extension turns AutoFixture into an Auto-Mocking Container. The mock instances are created by Rhino Mocks. To use it, add the AutoRhinoMockCustomization to your Fixture instance. Read more at http://blog.ploeh.dk/2010/11/13/RhinoMocksbasedAutomockingWithAutoFixture.aspx

Machine.Fakes attempts to simplify the usage of such frameworks on top of Machine.Specifications by helping to reduce a lot of the typical fake framwork related clutter code in specifications. If you choose so, Machine.Fakes even helps you to stay mostly independent of a concrete fake framework by providing a little wrapper API and a provider model... More information

Contributed features and third-party integration for Moq.

Machine.Fakes attempts to simplify the usage of such frameworks on top of Machine.Specifications by helping to reduce a lot of the typical fake framwork related clutter code in specifications. If you choose so, Machine.Fakes even helps you to stay mostly independent of a concrete fake framework by providing a little wrapper API and a provider model... More information

Unit testing simplified

Automock implementation for RhinoMocks using Ninject to create the objects under test.

Machine.Fakes attempts to simplify the usage of such frameworks on top of Machine.Specifications by helping to reduce a lot of the typical fake framwork related clutter code in specifications. If you choose so, Machine.Fakes even helps you to stay mostly independent of a concrete fake framework by providing a little wrapper API and a provider model... More information

Extensions for the mocking framework RhinoMocks

Library-level Fakes for your favorite POCO classes. WARNING: this is a pre-release build. Lots of work left to do.

WindowsPhoneMvp Mock Objects for Unit testing makes unit testing easier by providing Mock implementations of framework types and services. Normally a package like this is not necessary, however limitations in the Windows Phone runtime mean traditional Proxy-based mocking libraries will not work.

Machine.Fakes attempts to simplify the usage of such frameworks on top of Machine.Specifications by helping to reduce a lot of the typical fake framwork related clutter code in specifications. If you choose so, Machine.Fakes even helps you to stay mostly independent of a concrete fake framework by providing a little wrapper API and a provider model... More information

Test utility to instantiate a class by creating mocks for each of its dependencies

Mock objects for ASP.NET MVC classes

Some extensions which help to make F# code testable from C# test projects.