Top 20 NuGet stub Packages

The most powerful free mocking library available for .NET developers.
Testing layer for Microsoft's HttpClient library
A library to communicate with the HttPlaceholder REST API.
Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.
Easily create fake HTTP endpoints for integration testing
Library for creating Api stubs in .NET.
NMock3 is a Mocking framework that uses lambda syntax to setup expectations and test interactions between classes and interfaces.
Testing layer for Microsoft's HttpClient library. Use RichardSzalay.MockHttp unless you need a signed assembly.
Easy to use framework for creating mock objects, fakes, stubs with an intuitive and fluent API
Deleporter Core (use Deleporter.Server/Deleporter.Client for easy setup) - Simple Cross Process Stubbing. Deleporter is a lightweight .NET library that teleports arbitrary delegates into an ASP.NET application in some other process (e.g. hosted in IIS) and runs them there. One use case is stubbing ...
Test/mock (3rd party) code reliant on HttpClient, WebClient, HttpWebRequest and WebRequest.Create()
A small server for stubbing external systems during development.
Deleporter - Simple Cross Process Stubbing. Facilitates stubbing out dependencies when running automated browser tests against ASP.Net. Use in conjunction with your favorite mocking/IOC frameworks. Deleporter will teleport mock objects (or any arbitrary delegates) into a remote ASP.Net application, ...
A simple mocking library for TypeScript
A fakes framework for restsharp
A library to allow faking of client http logic with System.Net.Http. Supports recording and playback of responses. Particularly useful for separating client-side unit tests from web services.
A hybrid HTTP mock library that can start both in memory server and self host server. The core facilities can make complex things possible, and the extensions can make simple things simple. Usages can be found in project test cases.
Sinon Stub Promise (sinon-stub-promise) binding library for Bridge.NET projects.
Dynamically builds proxy types at runtime (see examples on the GitHub page).
An EntityFramework implementation of data access for AmazonDynamoDBStub.