GIS Links: Software
GeoCommunity has a comprehensive list of free GIS data viewers and downloadable demo software. http://software.geocomm.com/viewers/
ESRI, maker of ArcGIS, ArcInfo, and several extensions. http://www.esri.com/
ArcExplorer: ESRI's free lightweight GIS application for Mac or PC download and support. http://www.esri.com/software/arcexplorer/index.html
GRASS GIS (Geographic Resources Analysis Support System) is open source, free Geographical Information System (GIS) software with raster, topological vector, image processing, and graphics production functionality that operates on various platforms. http://grass.itc.it/download/index.php
Idrisi GIS, geographic analysis and imaging software developed by Clark Labs. http://www.clarklabs.org/
MapInfo. http://www.mapinfo.com/
Leica Geosystems image analysis software extension for ArcGIS http://www.leica-geosystems.us/en/index.htm
Erdas. http://www.erdas.com/Homepage.aspx
Open Source GIS Programs
