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ESRI: A leading software company for GIS such as ArcView and Arc/Info.
ERDAS: A mapping software company in Geographic Information Imaging Solution.
ETAK: Offers skymaps by using Global Positioning System
GEO World: Access to GIS related periodicals such as GIS world and Business Geographics.
Geoplace: Offers GIS World, GIS Europe, GIS Asia/Pacific. GeoInformation Africa, other mapping magazines, and GIS events and news, articles, and product reviews and much more.
GRASS (Geographic Resource Analysis Support System): Access to the software for a public domain raster and vector-based GIS, image processing system, and spatial modeling system.
NCGIA (National Center for Geographic Information Analysis) via UC-San Diego: Links to other NCGIA centers and their research publications and products.

Alexandria Digital Library Project: Links to a comprehensive list of spatial data on the Web.
American Factfinder Tutorial (U. of Michigan): Offers a web-based tutorial with excercises for the American Factfiner.
Federal Geographic Data Committee: Offers Information on the Contents of Digital Geospatial Metadata Standard and links to National Spatial Data Infrastructure (NSDI).
GIS via St. Charles City-County Library District: Offers a list of comprehensive GIS internet resources.
GIS Gateway (via U.S. Census Bureau)
GIS FAQ
GIS Jobs Clearinghouse and Geosearch: Top spots for GIS Job seekers and employers looking for new hires.
GIS Tools and Training: Offers tutorials on GIS software including ArcView and Arc/INFO.
GIS Tutorials for Creating Maps of Census Data using Wessex Products via University of Michigan
Metadata and WWW Mapping Home page: Links to the sites on Metadata and other useful Map Browsers.
Nice Geography and GIS Sites via University Utrecht: A collection of geography and GIS related sites all over the world.
Starting the Hunt: Provides sources of digital geospatial data and metadata related to the U.S.
Transforming Libraries: Issues on GIS: Offers issues related to libraries in providing GIS services and links to University GIS Sites.
Useful Sites for MapInfo Users
What is a GIS?