Arham

AJAX Control Toolkit
ASP.NET
AspxChat - generic MsAjax-based chatting control for ASP.Net 2
AutoMapper
BlogEngine.NET
BlogML .NET
C# Developer Utility Library
C# Facebook Graph API Library
CodePlex Information and Discussion
CommonLibrary.NET
Cryptography Library in .Net
Facebook Connect Authentication for ASP.NET
Facebook Developer Toolkit
Facebook Graph Toolkit
Facebook.NET
Json.NET
Microsoft Ajax Minifier
mojoPortal
MvcContrib: an Outercurve Foundation project
MyBusiness.NET - The .NET OpenSource ERP - System