https://www.nuget.org/packages/KenticoWebHelpers/
This is a few methods I'm using in my MVC based kentico solution for facilitate using razor view engine. This package tested only for kentiko 8, commpiled for .Net Framework 4.5 and require CMS.Base, CMS.Controls, CMS.DocumentEngine, CMS.DataEngine and CMS.SiteProvider. Pls feel free to contribute in project.