List of Free code MVC Library

Detergent
An ASP.NET MVC3 library for working with cascading drop downs.
Fluent Filters for ASP.NET MVC
A small library for ASP.NET MVC, that can be use as a facility for registering global filters of ASP.NET MVC 2 and add support of criteria for global filters for ASP.NET MVC 3.
Media Streaming - Resuming Downloads for ASP.NET MVC
Media Streaming / Resuming Downloads for MVC aims to provide a simple to use, HTTP compliant library usable in applications to accept and respond to partial content-range requests for media files. This supports iOS devices streaming media as well as resuming large downloads.
MyEntLibCMS
Enterprise Library 5.0,ASP.NET MVC 3,DotNetOpenAuth