For Windows (see the Help & Community section for info to run ArcGIS on a Mac and to get your AGOL account). Also provides access to ESRI Data & Maps worldwide GIS data, small scale for various themes – available with an ArcGIS software license via ualberta.onthehub.com.
For Windows, Mac, and Linux. Free and open source Geographic Information System.
Search for answers and ask questions of the Esri Community, connect, collaborate, share experiences, and suggest ideas for ArcGIS software.
Question and answer site for cartographers, geographers and GIS professionals on any geospatial software.