QGIS, Global Mapper, MapInfo Professional, ArcGIS, SAGA GIS, SuperGIS, CartoDB, OpenGeo Suite, gvSIG Desktop, MICRODEM, MapWindow GIS, OpenCage Geocoder, GeoNode, Google Maps Engine, Mapnik, GeoSheets, GRASS GIS, Mapline, plus.codes, Maptitude, TatukGIS Editor, Geoconcept, Azimap GIS, TdhGIS, MapLarge, Manifold, GeniusGIS, 3geonames, ESRI Geoportal Server, Spatial Feature Server are some alternatives to What3words.