Sahana is an open-source disaster manament tool  – we’re hoping to get a copy on our servers for people to play with in short order. The link will be – sahana.popularlogistics.com (nb: we don’t even have a placeholder up yet).

In the meantime, however TalkSahana is a blog, heavy on user contributions – and just reading posts one can the attention to detail, complexity and difficulty of the database design problem they’ve undertaken.