Starting today, administrators will be able to find, manage and deploy third-party applications directly from the Google Apps Admin console. To start, over twenty third-party applications will be available in the Admin console. These applications all offer the latest OAuth 2.0 security, single sign-on (SSO), and integration with Google services. Applications with OAuth 2.0 allow admins can deploy them to specific people or organizational units (rather than the entire company) and developers can design apps to request more narrow access to corporate information.
Google Apps for Business, Education, and Government
Reference by: http://www.google.com/