Top 20 NuGet asynchronous Packages

Code.Generation.Roslyn facilitates code generation driven by fit for purpose custom attributes.
DreamSeat is a CouchDB client for the .NET plateform. The library is based on Mindtouch Dream to allow synchronous and asynchroous calls
Asynchronous LINQ to Objects query processing
The "Cocktail Async Pack for Visual Studio 2012" enables Cocktail/DevForce 2010 projects targeting .NET Framework 4.0 or Silverlight 5 to use the Async language feature in C# 5 and Visual Basic 11. This pack requires Visual Studio 2012 and will not work with Visual Studio 2010.
The "Cocktail Async Pack for Visual Studio 2012" enables Cocktail/DevForce 2010 projects targeting .NET Framework 4.0 or Silverlight 5 to use the Async language feature in C# 5 and Visual Basic 11. This pack requires Visual Studio 2012 and will not work with Visual Studio 2010.
With Interaction Lib you can wire up most common ajax UI interactions with as few as 2 - 3 attributes right in your markup with no additional javascript. Also provides markup for wiring and configuring other jQuery/jQueryUI plugins. Provides support for unobtrusive configurations.
ISMOT Async Helper is a wrapper library for Microsoft's Async Library (CTP). Using this library greatly facilitates asyncrounous calls in Silverlight and Windows Phone projects.
ISMOT Async Helper is a wrapper library for Microsoft's Async Library (CTP). Using this library greatly facilitates asyncrounous calls in Silverlight projects.
A light-weight, async/non-blocking Memcached client for .NET
CouchDB API for .NET with asynchronous / synchronous support. This project is based on LoveSeat and DreamSeat and has as goal to extend the API support, improve the source code and provide better documentation.
ServiceProxy.Redis is a simple request/reply messaging framework built on Redis queues that support service contracts using ServiceProxy and the StackExchange.Redis library.
WebApiClient is a simple and powerful .NET Portable Library built to work as a middle layer between your application and a RESTFul service, like the Microsoft WebApi. It provides methods to make asynchronous, typed WebApi requests using the HttpClient class. It takes care of all the logic ...
Extensible Asynchronous File Logger
Asynchronous .NET library for downloading Vimeo video's
Radius client. Send packets to radius servers. Packets can be sent asynchronously and are mapped to response using remote endpoint and identifier
Web API exposing the AsTrEAM asynchronous WCF stream service to help setting up a multi-tier architecture.
Adds an asynchronous stream service to a WCF Service Application
Provides Stream.CopyTo overloads for reporting the current relative or absolute progress while copying.
Provides an easy to use asynchronous HTTPS and HTTP that is ultra light-weight, portable, and fast for usage with micro-services. Intended to replace heavy-weight resource hungry and wasting frameworks with something that is dependable, simple to maintain, and fast.