The introduction of the Cloud paradigm has rapidly changed IT-infrastructures in modern organizations. The application of Cloud systems to manage a growing number of IoT devices such as sensors is continually unfolding and revealing new opportunities. A notable field of research is related to the development of models, applications and real testbed on robots that can be managed and coordinated remotely at a higher layer involving network communications. In this paper, we present Open CLORO: an open testbed for Cloud robotics. We propose Open CLORO, which serves as a benchmark for real experiments for various network applications in which the Robots are equipped with programmable devices that also provide network connectivity and grant access from remote. We provide a detailed overview of the proposed architecture that can be effective for developing and testing not only robots-related experiments but also a wide number of network applications such as distributed coordination, vehicle-to-vehicle communications, and Cloud-based management services.