TCT.Web.Helpers.Bootstrap.IsActive (nuget): This package is for use in MVC 5 sites that utilize the bootstrap theme. It allows you to pass in the action/controller and set the active class of a list item in the menu.  Note: This can be used to inject any string content including html into a page based off of the action/controller that is currently active. Built for MVC 5 but should work with MVC 4 as well.
Keywords: mvc|bootstrap