QGIS

QGIS
Available for Windows, Macintosh, Linux operating systems.

A popular free and open source desktop GIS application with a large user and development community.  Provides complex analysis and cartographic capabilities with support for additional functionality through user-developed plugins.  Part of the larger OpenGeo Suite of applications. Supports both vector and raster data layers. Supports multiple formats of remote images, with QGIS you can georeferenced images.

The UA Libraries periodically offers QGIS workshops throughout the academic year. Check the event listing for upcoming workshops or the GIS and Geospatial Data website.