Top 20 NuGet http Packages

A node.js style event driven webserver for .Net
HALClient is a standalone client consuming HAL powered hypermedia APIs
This small library is a wrapper around the use of HttpWebRequest\WebRequest classes in the .Net framework and is designed to make the use of RESTful web service in a .Net application as easy as possible.
Nonocast.Http is a free, open source developer focused web service via http for small and medium software.
WebApiDoodle.Net.Http is a library which provides more features over System.Net.Http
WebApiDoodle.Net.Http.Client is an ASP.NET Web API library which contains several useful Extensions, Filters, Message Handlers and so on and so forth.
Memcached storage for HTTP caching in CacheCow library [Version 1.2 of Memcached server]
Memcached persistence for server-side CacheCow [For version 1.2 of Memcached server]
F# extensions for System.Net.Http
F# extensions for System.Web.Http
JsonRPC Portable Class Library
Lightweight HTTP Services Library using DuoVia.Net.
HAR Http Archive format API Core
Owin.IAppBuilder support for Fix, a glue for OWIN.
A web browser replacement for testing websites without the browser overhead.
Client library for OWIN-based lightweight services .NET.
ASP.NET Web API Implementation of Five Levels of Media Type according to http://byterot.blogspot.co.uk/2012/12/5-levels-of-media-type-rest-csds.html
Centaur is a library to launch IISExpress for test automation.
A media type formatter for enveloped responses.
Fracture HTTP is an F# based HTTP server built on top of the high-speed, high-throughput Fracture sockets library.