This document describes the development of an open source web application called HSMapper to help optimize pediatric hospital finding in Italy. The app collects reliable data from certified sources, provides an easy-to-use interface on web and mobile, and analyzes data using GIS tools. It was developed in close collaboration with medical experts and uses open technologies. The initial case study focused on pediatric facilities in Sicily. The results show a prototype that offers improved accessibility to existing facilities, and the developers aim to expand data collection, add more features, and implement analysis tools.