HtmlHelper extensions and supporting config transforms for running SiteCore MVC sites outside the SiteCore runtime. Code samples for http://geekswithblogs.net/EltonStoneman/archive/2013/07/16/developing-a-sitecore-mvc-site-without-sitecore.aspx.

SiteCoreStub-HtmlHelperExtensions.cs

using System.Collections.Generic;
using System.Web.Mvc;

namespace SiteCoreStub
{
    public static class HtmlHelperExtensions
    {
        public static Sitecore Sitecore(this HtmlHelper helper)
        {
            return new Sitecore();
        }

        public static Sitecore Sitecore<TModel>(this HtmlHelper<TModel> helper)
        {
            return new Sitecore();
        }
    }

    public class Sitecore
    {
        public CurrentItem CurrentItem
        {
            get { return new CurrentItem(); }
        }

        public Placeholder Placeholder(string name)
        {
            return new Placeholder();
        }
    }

    public class CurrentItem
    {
        public string DisplayName
        {
            get { return "SiteCore: display name"; }
        }

        public FieldCollection Fields
        {
            get { return new FieldCollection(); }
        }
    }

    public class FieldCollection : Dictionary<string, Field>
    {
        public Field this[string name]
        {
            get
            {
                this.Add(name, new Field() { Name = name });
                return base[name];
            }
        }
    }

    public class Field
    {
        public string Name { get; set; }

        public string Value
        {
            get { return "SiteCore: field value for " + Name; }
        }
    }

    public class Placeholder {}
}

SiteCoreStub-Views-Web.NoSiteCore.config

<?xml version="1.0" encoding="utf-8"?>

<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <system.web.webPages.razor>
    <pages pageBaseType="System.Web.Mvc.WebViewPage">
      <namespaces xdt:Transform="Replace">
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
        <add namespace="SiteCoreStub"  />
      </namespaces>
    </pages>
  </system.web.webPages.razor>
</configuration>

SiteCoreStub-Web.NoSiteCore.config

<?xml version="1.0" encoding="utf-8"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <appSettings>
    <add key="NoSiteCore" value="true" xdt:Transform="Insert"/>
  </appSettings>
  <sitecore xdt:Transform="RemoveAll" />
  <system.web xdt:Transform="Replace">
    <globalization culture="en-GB" uiCulture="en-GB" />
    <customErrors mode="Off" />
    <httpRuntime targetFramework="4.5" enableVersionHeader="false" />
    <compilation debug="true" targetFramework="4.5" />
    <pages>
      <namespaces>
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.WebPages" />
      </namespaces>
    </pages>
    <profile defaultProvider="DefaultProfileProvider">
      <providers>
        <add name="DefaultProfileProvider" type="System.Web.Providers.DefaultProfileProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
      </providers>
    </profile>
    <membership defaultProvider="DefaultMembershipProvider">
      <providers>
        <add name="DefaultMembershipProvider" type="System.Web.Providers.DefaultMembershipProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />
      </providers>
    </membership>
    <roleManager defaultProvider="DefaultRoleProvider">
      <providers>
        <add name="DefaultRoleProvider" type="System.Web.Providers.DefaultRoleProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
      </providers>
    </roleManager>
    <sessionState mode="InProc" customProvider="DefaultSessionProvider">
      <providers>
        <add name="DefaultSessionProvider" type="System.Web.Providers.DefaultSessionStateProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" />
      </providers>
    </sessionState>
  </system.web>
    <system.webServer xdt:Transform="Replace">
      <validation validateIntegratedModeConfiguration="false" />
      <handlers>
        <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
        <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
        <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
        <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
        <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
        <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
      </handlers>
    </system.webServer>
</configuration>