Top 20 NuGet ASP.NET Packages

StyleMVVM.MVC4 is a companion library for ASP.Net MVC 4 application, adding dependency injection and validation (.Net only)
JavaScript URL routing for ASP.NET MVC. Allows you to use your ASP.NET MVC routes from JavaScript. Please refer to project site (http://dan.cx/projects/routejs) for more details, usage examples and sample code.
Another library include extension methods focused on Persian .NET applications.
F# extensions for System.Net.Http
F# extensions for System.Web.Http
Extensions for DynamicImage providing integration with ASP.NET MVC 4
A C# Server side component for the popuplar jQuery datatables plugin http://datatables.net/
F# Lightweight Web API Framework
Cache extensions for ServiceStack ICacheClient. Includes cache context and mvc donut caching.
A fairly responsive paged data grid for use with KnockoutJS and Breeze. This package contains the styles and code for the control as well as initial documentation. This package DOES NOT include the Durandal widget. There is a specific package that handles the widget install.
LESS BundleTransform, HttpHandler for integrating with ASP.NET MVC 4
System.Utilities.Web is a collection of helpers and extension methods for quickly solving and aiding with common .NET web related programming tasks.
Rinky lets you define RESTful links using attributes on action methods in ASP.NET Web API WebHost.
Extensions to HtmlHelper for things like checkbox lists, adds support for most to HTML5 input types and provides a fluent strongly-type way of specifying attributes.
MvcKickstart module used to easily plug in RestSharp.
The pack with additional helpers and wrappers for ASP.NET MVC applications, based on dependency injection, thus fully testable.
Allows Glimpse users to view and diagnose Bundles, and see which are in use on the current page.
Unobtrusive EPiServer 7 page editor support for ASP.NET MVC applications, friendly URLs and extendable API for custom model processors.
Sidewired's Core Components.
Components for using Sidewired in ASP.NET MVC Web Applications.