Free GIS Resources

Canada GeoBase Portal
Canadian Government
Earth Observation Portal
FreeGIS.org data/mailing list
GeoConnections Discovery Portal
GIS Data Depot
Global Change Master Directory
Global Land Cover
GTOPO Elevation Data
MapServer list
NASA Topography
U.S. Geologic Survey
U.S. Maps and Data
U.S. National Atlas
U.S. National Geospatial Data Clearinghouse