The mOSAIC project (mosaic-project.eu) 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 platform via the innovative API. The platform will implement a multi-agent brokering mechanism that will search for services matching the applications' request, and possibly compose the requested service if no direct hit is found. Cloud-application developers and maintainers will be able to postpone their decision on the procurement of Cloud services until runtime, while end-user applications will be able to find best-fitting Cloud services to their actual needs and efficiently outsource computations. The platform will facilitate competition between Cloud providers, who, in return, will be able to reach customers they could not reach before.The platform acceptance by end-users depends on the number of connectors to the existing Cloud providers, standard usage, the number of communities reached during the project time, as well as the scale of the dissemination activities. In this context, the present mOSAIC+ proposal intends to increase the technology stack of the mOSAIC API by implementing Dynamic Semantic Discovery capabilities, as well as by developing connectors (agents, wrappers) to the main-stream commercial Cloud providers. The existing mOSAIC project will benefit from complementary expertise provided by partners from the New Member States. Consequently, this additional effort will lead to an increasing number of facilities provided by the mOSAIC platform, a greater number of the Cloud providers that are connected to the platform, as well as more user-friendly platform deployment, testing and benchmarking into new environments. Moreover, new use cases will demonstrate the generic nature of the proposed technology in other areas, beyond those initially planned as well as its usability for new end-user communities, such as from engineering domains.