Hi Pedro,
TNTmips is good (true GIS rasters and vectors in one package) which has full
functionality in a TNTlite version which is free (limits image, database
size). Good structural mapping symbology. Well worth a look.
http://www.microimages.com/product/tntmips.htm
ERmapper site:
http://www.ermapper.com/
ArcView site:
http://www.geogr.uni-jena.de/~c5sthe/esrisources.html
MapInfo site
http://www.mapinfo.com/ Produces good maps, eg Geol Survey of Botswana
published products, but is not a true GIS.
Good luck!
Gordon.
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