ArcGIS Online provides users the ability to download basemaps and pre-made layers, create basic webmaps and create their own data. Sign up for a free ArcGIS Online account and start making maps right away!

Version 3.x, launched April 2018, includes major updates. Create, edit, analyze and publish geospatial information. Includes an Android app. Can create and add layers, basemaps and perform raster and vector analysis. You must download the software to your computer. QGIS is the most robust open source GIS.

If you've used commercial tools like: ERDAS IMAGINE, RemoteView, ENVI, or SOCET GXP, then you need to give Opticks a try. Opticks provides the most advanced extension capability of any other remote sensing tool on the market.

GeoServer allows you to display your spatial information to the world. Implementing the Web Map Service (WMS) standard, GeoServer can create maps in a variety of output formats. OpenLayers, a free mapping library, is integrated into GeoServer, making map generation quick and easy

Free GIS software with the ability to add basemaps, create interactive maps, and perform spatial and geographic analysis using LiDar, raster and vector data. You must download the software to your computer.

GIS tool that allows users to download maps, images and other geographic information. Also enables the viewer to see photographs and other enriching data for a given area. The application must be downloaded to your computer.