This document provides information about open source geospatial tools that can be used for geographic information systems (GIS). It lists several commonly used open source GIS tools including PostGIS for spatial databases, Quantum GIS and GeoServer for mapping and web services, and OpenLayers and Leaflet for interactive web mapping. It also provides examples of architectures using some of these tools that have been applied to systems in Kosovo for tracking unpermitted construction and for the Special Prosecution Office of Kosovo.