The NexSIS project aims to create a digital rescue platform providing all civil protection actors in France with a complete set of cloud operational services. Open Source GIS solutions were chosen for this national project with strong technical requirements. This has a direct impact on the way data will be exploited. Each Fire Department will have to adapt and create data that will be directly used by the NexSIS software (areas that require special equipment or specialized teams for example). Currently in France each fire department has a budget depending on the size / number of people in the department. This budget is used to buy new fire extinguishers, computers, but also to hire new people, etc... Most departments currently use many different proprietary softwares for all GIS aspects. Historically, each department has made their own choices on what software they use. This talk will show how we are helping fire brigades to make the switch to Open Source without losing any functionalities and without any extra work load. Using the power of both QGIS and PostgreSQL, we will show how these tools can be used to share and publish common workflows (qgis expressions, model builders) that are often used in fire emergencies, build a common atlas (report module), edit spatial data (forms, and constraints) and so forth.