This C# OpenID library adds OpenID 2.0 Provider and Relying Party support to your web site both programmatically and through convenient drop-in ASP.NET controls.
SyncToy, a free PowerToy for Microsoft Windows, is an easy to use, highly customizable program that helps users to do the heavy lifting involved with the copying, moving, and synchronization of different directories. Most common operations can be performed with just a few clicks of the mouse, and additional customization is available witho
Visual WebGui is another 'Web like Desktop' platform that offers an open source framework to develop applications that work in *both* DHTML/AJAX and Silverlight
Sculpture is a .NET open source Model-Driven Development code generation framework... can model your application components, and then transform this model to deployable components ... comes with ready-made molds like NHibernate, LINQ, WCF, etc
F# is a functional programming language for the .NET Framework. It combines the succinct, expressive, and compositional style of functional programming with the runtime, libraries, interoperability, and object model of .NET. -- and it had a new CTP in September 2008
Managed Extensibility Framework (MEF) is a new library in .NET that enables greater reuse of applications and components ... but it's (currently) licensed under the unacceptable MS-LPL ... where that extra L stands for "lock-in"