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In recent years geo-information technologies have significant increase in various domain implementations. Such methodologies and applications are gathering more interest in aspects such as data collection, processing, analyses, and dissemination. Covering the full processing cycle, these technologies are impacting many fields, even those where traditionally there were no or few geospatial specialists. A relevant example can be the domain of Disaster Management and Risk Reduction (DMRR), where geo-information is providing powerful tools for effective management in the prevention, preparedness, response and recovery processes, which are of high interest to authorities and stakeholders. However, in certain cases, an important aspect is still under-considered -the "power of the crowd", which can bring vital knowledge and strength. Recently, also hazard specialists started to elicit the participation of citizens and to promote collaborative approaches in their mitigation strategies, whether it is for data collection (local or remotely), or to reduce the time a certain task is done, or simply to further disseminate knowledge and practices. As it is becoming a multi-field and multiapplication domain, with our contribution we want to present the state of the art of the open and collaborative tools that are applied in DMRR, regardless of the hazard type, of the used platform (mobile, desktop) and the approach (remote, onsite). In addition, tools currently applied in other domains, but that can be fruitfully used also in DMMR will be included in our speech.

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