Hybrid cloud, federated marketplace, inter-cloud and cloud exchange. All these terms describe different and complex perspectives in terms of evolution of the cloud computing industry. While they can be distinctly differentiated, they share some commonalities. We propose to discuss the relationships which can be defined between them, and to expose the standards and technology which can handle this complexity. CompatibleOne, the Open Cloud Broker is an open source application enabling a new-generation of cloud resources provisioning called Cloud Services Brokerage. Based on open source and open standards, CompatibleOne preserves the consumers from vendor lock-in.