It is well-known that Free Open Source Software is part of Space and Planetary Exploration, and the latest generation of rovers and drones on Mars embed FOSS components and frameworks. But what about Free Open Source for Geospatial software and data access and availability? We will travel the timeline of planetary cartography, from the first steps of remote and direct observation of the bodies of our Solar System to the era when Geographic Information Systems spread in Planetary Science and FOSS4G starts to play an essential role in studies and missions to environments beyond planet Earth.