Windows Azure Pack

 Microsoft announced Windows Azure Pack during TechEd 2013 NA conference in June, replacing "Windows Azure Services for Windows Server" technology , which was made available in January 2013.
According to the company's Windows Azure Pack Overview:

The Windows Azure Pack delivers Windows Azure technologies for you to run inside your datacenter, enabling you to offer rich, self-service, multi-tenant services that are consistent with Windows Azure.

 The Windows Azure Pack is a collection of Windows Azure technologies available to Microsoft customers at no additional cost. Once installed in your datacenter, the Windows Azure Pack integrates with System Center and Windows Server to help provide the following capabilities: 

• Management portal for tenants
• Management portal for administrators
• Service management API
• Virtual Machines
• Service Bus
• Automation and extensibility 



Additional Information:

Windows Azure Pack for Windows Server

Windows Azure Pack (#WAPack) and Related Blogs, Videos and TechNet Articles

Windows Azure Pack - Installing & Configuring Series.

Cmdlet Reference Download for Windows Azure Pack for Windows Server

Technical Documentation for Windows Azure Pack for Windows Server Download Center

Windows azure Pack: Cloud app convenience meets in-house hosting

Microsoft finds a new way to deliver a private cloud in a box

Windows Azure Pack High Availability

Enabling On-demand Infrastructure Services In Your Datacenter with Windows Azure Pack

Enabling Modern Apps with the Windows Azure Pack

IaaS Usage and Service Reporting using System Center 2012 R2 and Windows Azure Pack

WAP: Service Bus 1.1 (preview) for Windows Server - Your private Service Bus Installation using Hyper-V

Configuring SPF and Windows Azure Pack for IaaS usage and metering

Windows Azure Pack (#WAPack) and Related Blogs, Videos and TechNet Articles

Windows Azure Pack blog posts on Building Clouds & TechNet