Top 20 NuGet ASP.NET Packages

AttributeRouting for ASP.NET Web API lets you specify routes using attributes on your API controllers and actions.
A simple Test Client built on top of ASP.NET Web API Help Page.
HAL Models for producing HAL Json
Seamlessly adds a Swagger to WebApi projects! Compiled for .NET 4.5 and up. This helps with mono compatability and does not require any assembly redirects.
A simple enterprise content management system
Dot Net abstraction of javascript toastr to create toast notification on ASP.NET Core MVC Projects
Abp.Quartz
A C# to JavaScript compiler. Write modern mobile and web apps in C#. Run them anywhere with JavaScript.
This library contains a collection of common .NET components and extensions that can be used in a variety of .NET solutions built by the community.
ASP.NET Core plain text formatter, used for returning plain text API responses and accepting plain text requests.
The GTmetrix-net .Net client interacts with the GTmetrix.com REST API allowing you to utilize GTmetrixs features using a .NET interface.
AspNet.Mvc.TypedRouting is a class library allowing typed expression based route registration and link generation for ASP.NET Core MVC. See the project repository for more information and available features.
A library enabling typed routing in ASP.NET MVC Core projects. Next generation of the Strathweb.TypedRouting Web API 2 library.
Extensions for ASP.NET Core MVC validation framework.
Allows backwards compatibility for your JSON based APIs by differentiating between 'Null' and 'Not Supplied'. This is the JsonConverters package which allows correct serialization and deserialization of OptionalTypes in Asp.Net Core and WebAPI.
Extensions for ASP.NET Core rewriting middleware.
A simple to use REST client for .NET Core
AspNetCore.Mvc.HttpActionResults.ClientError is a collection of client error HTTP status code action results for ASP.NET Core MVC. See the project repository for more information and available features.