cartography

GRASS GIS (Geographic Resources Analysis Support System) is an open source, free software (FOSS) Geographical Information System (GIS) with raster, topological, vector, image processing, and visualization functionality.

Map-making software for creating tactical-scale top-down battlemaps for RPGs, with a large library of ready-to-use mapping content Add-Ons (including 50 free ones!). Also works with your own artwork/bitmaps, via drag-and-drop.

MICRODEM is a freeware microcomputer mapping program written by Professor Peter Guth of the Oceanography Department, U.S. Naval Academy. MICRODEM displays and merges digital elevation models, satellite imagery, scanned maps, vector map data, and GIS databases.

ArcGIS offers unique capabilities and flexible licensing for applying location-based analytics to your business practices.