Read through this tutorial and the wikipedia entry on GIS software. Your task is to summarise the current state of GIS software.
Introduction to GIS
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Source: UNESCO, 1999. Training Module A: Introduction to GIS, UNESCO Training Modules on the Applications of Geographic Information Systems. <http://ioc.unesco.org/oceanteacher/oceanteacher2/other/GISModules/Module_a /index.html> URL last accessed 18-10-2006.

GIS Software
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Source: Wikipedia. GIS Software. <http://en.wikipedia.org/wiki/Gis#GIS_software > URL last accessed 18-10-2006.