Geographic Information Systems - Desktop
ESRI has been the leader for many years, but the open source movement is making gains. QGIS is a great free and open Desktop GIS solution. As a professional in the GIS industry, I recommend having an intimate knowledge of both.
Here are links to download each:
ESRI
QGIS
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QGIS is excellent! Couple it with other open source software like Grass GIS and they can do just about everything that ArcGIS (ESRI) can do...though in a slightly different way.
Exactly - Open Source is very competitive!