The mOSAIC project aims to develop an open-source platform that enables applications to negotiate Cloud services as requested by their users. Using the Cloud ontology, applications will be able to specify their service requirements and communicate them to the mOSAIC platform. The platform will provide a mechanism for searching the services matching the applications’ request. This way the platform will facilitate competition between Cloud providers, who, in return, will be able to reach customers they could not reach before.