The document discusses OpenNebula, an open-source toolkit for building Infrastructure as a Service (IaaS) clouds. It originated from the RESERVOIR European research project. OpenNebula allows organizations to build private, hybrid, and public clouds to manage their infrastructure resources. It has over 4,000 downloads per month and is used by many organizations and projects to build cloud computing testbeds and ecosystems. The document outlines OpenNebula's innovation model and calls for collaboration to address challenges regarding cloud adoption and key research issues in areas like cloud aggregation, interoperability, and management.