Each Infrastructure-as-a-Service cloud existing today[when?] provides its own API. The purpose of Deltacloud is to provide one unified REST-based API that can be used to manage services on any cloud. Each particular cloud is controlled through an adapter called a "driver". As of June 2012, drivers exist for the following cloud platforms: Amazon EC2, Fujitsu Global Cloud Platform, GoGrid, OpenNebula, Rackspace, RHEV-M, RimuHosting, Terremark and VMwarevCloud. Next to the 'classic' front-end, it also offers CIMI and EC2 front-ends. Deltacloud is used in applications such as Aeolus to prevent the need to implement cloud-specific logic.