The presentation will show how OpenNebula is impacting the adoption of cloud computing and enabling business models based on open-source cloud technology. First, most organizations adopt cloud to optimize their IT investment, to improve existing services or to support new business and service models. In this scenario, open-source lowers the barriers for new organizations to build their private cloud. Second, many organizations like the fact that open source allows great customization to meet individual requirements. They can build a differentiated cloud service to meet customers needs or to offer new cloud provision models for a specific market segment or geography. Third, open-source also encourages and supports innovation in the development of new cloud products. We have seen many examples of how its use lowers the barriers for new ICT players to create their own cloud offerings. Finally, collaboration between technology providers and users is a huge advantage in the open source arena, OpenNebula is providing a framework to work together to build an open interoperable cloud ecosystem.