Open-AudIT can discover and audit your cloud-based virtual machines. You provide the credentials and Open-AudIT will query the Amazon or Microsoft APIs to determine what devices you have, their state, any associated networks and locations and then run discovery upon each cloud instance. You get all the regular Open-AudIT details, but now you also get cloud-specific details like size.
You provide the credentials, Open-AudIT does the rest.
For more detailed information, check the Open-AudIT Knowledge Base.