I don't know whether you consider Computer-Aided-Dispatch (CAD) under the rubric of "GIS software", but our project, Tickets CAD, certainly does integrate data with mapping/geo technology. And it's free, and Open Source predominantly, See at www.ticketscad.org.
And it is being used in some public safety operations. I will have to poll our users for permission to provide site names. Please understand the political ramifications of such usage: An agency has years of unsuccessfully requesting budget $ for the purchase of a commercial CAD product, which they demonstrably need, and now - suddenly - a free one surfaces. Best is probably to do it quietly and avoid raised eyebrows and questions. (CAD may well be among the earliest examples of such integration.) AS Tickets CAD Project Lead (the adjective, not the noun!) developer
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