Apps similar to MapViewer include ArcGIS. It's paid, but KML viewer and converter and TdhGIS are free. Other options are Azimap GIS, Corgilytics and GeoSheets. In total there are six GIS Software like MapViewer for the web, Android, iPhone, Windows and Linux.
ArcGIS offers unique capabilities and flexible licensing for applying location-based analytics to your business practices.
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KML to KMZ, Geojson, Topojson, GPX, CSV, converter now available on the app store feel free to download because it's fully free. convert any compatible file format.
Azimap is a web GIS developed on open source principles and offers GI professionals with the tools to visualise, analyse and share their spatial data on the web.
Corgilytics allows non-technical users to explore geographies using demographic, psychographic and other useful data sets.
GeoSheets is a free add-on for Google Spreadsheets that makes it simple to do lightweight GIS tasks like geocoding, address normalization, distance calculations and creating customized and embeddable maps.
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