Freeware tool for Windows (XP or higher) for showing and changing geo data and other metadata (IPTC/XMP/Exif) of image files (e.g. images taken by digital cameras).
GPSBabel converts waypoints, tracks, and routes between popular GPS receivers and mapping programs. It also has powerful manipulation tools for such data.
GPS Visualizer (GeoVisualizer) is a free utility that creates customizable maps and profiles from GPS data (tracklogs & waypoints), addresses, or coordinates.