GearScape is a Free and Open-Source Software (FOSS). It is a Geographic Information System (GIS), that is a software dedicated to storage, retrieval, analysis and mapping of geographic data. More precisely, it is a platform focused on geo-processing that can be used in both interactive and batch modes. Its two main distinguishing features are: on the one hand it can be extended not only through the Application Programming Interface (by an advanced user with clear programming skill) but also through a simple spatial SQL based language called GGL (by a common end user), and one the other hand it relies on a generic layer that intends to uncouple the geo-processes with the specificities of each underlying spatial format. Extensibility and re-usability in a groupware context are the two main reasons that justify its clear appropriateness to the Territorial Intelligence main thematic.