Embotics® vCommander™ provides role-based access control, allowing you to ensure that:

• Administrators have the right level of access to the various parts of your virtual infrastructure
• Data for the various groups of users that consume your IT services is appropriately segregated

vCommander has both an administrative console and a Service Portal, with roles governing where users are permitted to log in.
http://www.embotics.com/documentation/index.html?user_mgmt.htm