Top 20 NuGet asp.net Packages

Enhances the Narvalo.Mvp package with support for ASP.NET WebForms. Samples are available on the project web site.
ActionMailerNext is a painless way of using razor view to render emails. This version runs with ASP.MVC 3. ActionMailerNext is a continuation of the ActionMailer.Net project.
ActionMailerNext is a painless way of using razor view to render emails. This version runs with ASP.MVC 4. ActionMailerNext is a continuation of the ActionMailer.Net project
ActionMailer integration with the Postmark mail sending service.
Simple and flexible fluent validation framework for .NET for ASP.NET MVC applications
Package Description
Simple cache wrapper for asp.net projects. Supports Filesystem and InMemory out of the box
Adds HtmlHelper extension methods to correctly serialize dictionaries.
Change RequireJS.NET to use default.js in controller folder
A OWIN server for the Azure Service Bus Relay
Web API 2 library allowing you to define strongly typed direct routes.
The ASP.NET Membership Provider for NuoDB® enables an ASP.NET application to authenticate web users using a table inside a NuoDB database.
Utilize DataAnnotations on your ASP.Net Web API models and return your own complex validation models, flattened models or default model state models.
A simple Twitch OAuth2 client/provider for ASP.NET websites
Simple to use library for returning custom / vendor media type headers when using Web API. Register types explicitly or by convention with overrides, excludes and required custom interface options. eg. application/vnd.yoursite.customer-v1+json
This is a simple class for spinning up an ASP.Net Web API self host. I use it regularly within my test code.
A library of core helpers, extensions, constants, enums and other useful things for all ASP.NET MVC projects.