The OCCIware project aims to lower cloud computing adoption costs and break barriers between implementations through formalizing and extending the Open Cloud Computing Interface (OCCI) standard. The project developed an Eclipse-based, model-driven platform for managing cloud resources across multiple domains. It addressed challenges including the need for open standards, hybrid cloud elasticity, data-centric clouds, and cloud management. The 72 person-month, 5.6M Euro project involved 3 academics and 5 companies and resulted in a formal OCCI model, tools, and use cases spanning infrastructure, big data, deployment, and linked data.