Ask HN: Emergency "Management" Software?

Folks, I seem to vaguely recall that such a thing exists and was wondering if I could... count on you all to help me locate it. I am looking for something that I would describe as an open source emergency or crisis "management" platform. Something that would enable volunteers, resources, locations to be managed efficiently in a (hopefully) single online platform that can be self-hosted with as meager resources as possible or alternatively, if such a thing exists, hosted by some third party. Something that would enable organizations also to register themselves in a CRM kind of capability, but one that ideally would have as many features as possible that would come in handy under extreme circumstances, earthquakes, floods, and the like. I am sure that somebody must have come up with some solution enabling a core set of features such as I am describing, or that at least best practices must exist for this sort of software. Any pointers are appreciated.