Google Maps, Map Chart, OpenLayers, Mapbox Studio, HERE WeGo, Mapme, OpenGeo Suite, YourMapp, Leaflet, GeoServer, Sharemap, Paintmaps.com, indiemapper, OpenMapTiles, MangoMap, EasyMapMaker, MapTiler Cloud, TomTom Maps APIs, vMAP Portal, Rasters.io, MAPCAT.com, TallyGo, Map Kit Framework are some alternatives to Map3.