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Ado.Net Entity Framework Membership Provider (Code first)
ASP.net MVC Awesome - jQuery Ajax Helpers
ASP.NET MVC CMS ( Using CommonLibrary.NET )
ASP.NET MVC Extensions
ASP.NET MVC SiteMap provider
ASP.NET WebSocket & Comet Ajax Library (Reverse Ajax - Server Push)
CommonLibrary.NET
DotNetAge CMS for ASP.NET Mvc3
Facebook Helper
jQuery ASP.Net MVC Controls
Kooboo CMS
LiteBlog (MVC)
mesoBoard | Open source ASP.NET MVC message board and forum
Microsoft .NET Gadgeteer
Microsoft All-In-One Code Framework - a centralized code sample library
MongoMvc - ASP.NET MVC 2 & MongoDB
MVC Controls Toolkit
MvcCodeRouting
MvcContrib: an Outercurve Foundation project
NBlog : ASP.NET MVC 3.0 Blog Engine