Exiv2 - Exiv2 is a C++ library and a command line utility to manage image metadata.
Geosetter - GeoSetter is a freeware tool for Windows (requires Internet Explorer 10 or higher) for showing and changing geo data and
PhotoME - PhotoME is a powerful tool to show and edit the meta data of image files.
Geotag - GeoTag is a freeware tool for Mac for showing and changing geo data of image files (e.g.
ExifToolGUI - Graphical user interface to https://alternativeto.
Houdahgeo - With HoudahGeo you may "pin" photos to locations where they were taken.