
Google Earth Engine
6.9#12 in gis softwareFrom $500 a monthFree planWebAPILinux
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Earth Engine suits scientists, researchers, developers, nonprofits, businesses, and government users working with geospatial analysis. It may be useful for remote sensing, climate analysis, natural resource management, and sustainability work.
WorldWind is for developers building geospatial applications and organizations visualizing geographic data. Its web and Java options cover browser use as well as Windows, Mac OS X, and Linux.