Dive into the world of Geographic Information System (GIS) software, where data meets geography. This category is a treasure-trove of both self-hosted tools and open-source projects that help in mapping, spatial querying, and geolocation services. Unlock patterns, relationships, and trends that could transform your understanding of spatial information. Whether you're a cartographer at heart or simply fascinated by geospatial analysis, this GIS category has something for you.