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The Facebook C# SDK helps .Net developers build web, desktop, Silverlight, and Windows Phone 7 applications that integrate with Facebook.

Facebook C# SDK – Release v5.2.1

JSON.net makes it easy to consume JSON encoded objects in your application. It features a fast parser and deserializer written in C# 2.0 with a simple and intuitive API making integration in your application a breeze

.NET JSON parser & deserializer Beta 2

DotNetNuke® is a world class web content management platform (CMS) for building professional websites with dynamic content and interactive features. DNN® makes it quick and affordable to develop a commercial website, a community portal, or an intranet solution.

WPFSpark is a library of user controls which can be used by developers to enhance their applications.

WPFSpark v0.7