GTOPO30 - Global Topographic Data

Digital elevation model (DEM) developed to meet the needs of geospatial data users for 30-arc second elevation data.
http://edcwww.cr.usgs.gov/landdaac/gtopo30/gtopo30.html

GIS Data Depot

Provides free GIS data downloads and creates custom spatial data CD-ROMs.
http://www.gisdatadepot.com/

United States National Atlas

Map layers available to the public.
http://www.nationalatlas.gov/atlasftp.html

Baltic Sea GIS, Maps and Statistical Database

GIS data of land cover, population and other information for the Baltic Sea drainage basin.
http://www.grida.no/baltic/

Digital Chart of the World

Download the boundaries and layers of different countries, in Arc/INFO export format.
http://www.maproom.psu.edu/dcw/

Energisite.com

Internet delivery of online digital and raster well logs, well data, GeoCadd culture, and Analytical software using esri and AutoDesk MapGuide and AnGIS technologies.
http://www.energisite.com/

Texas Natural Resources Information System

Clearinghouse for natural resources and GIS data. Online holdings include DOQs, DEMs and many vector datasets.
http://www.tnris.state.tx.us/

Hawaii Statewide GIS Program

Free downloadable GIS spatial data, metadata, and maps.
http://www.hawaii.gov/dbedt/gis/

MapFocus GeoTIFFs

Digital raster graphics for GIS and CAD applications. Includes continental US coverage, full resolution topography.
http://www.mapfocus.com/

Transnational Wadden Sea Information Service

Indices, GIS datasets and data source holders in countries around the Wadden Sea.
http://www.waddenseamaps.net/

Tennessee Spatial Data Server

GIS data for the state of Tennessee. DOQQs, DRGs, DEMs, boundaries, wetlands, and geology.
http://www.tngis.org

Louisiana Statewide GIS

Contains GIS and mapping data on the state of Louisiana.
http://atlas.lsu.edu/

GeographX Digital Mapping

New Zealand land information and GIS services. Site offers some free data.
http://www.geographx.co.nz/

Rainwater Basin GIS data site

This site provides free GIS data sets pertaining to the Rainwater Basin wetlands in Nebraska.
http://www.calmit.unl.edu/rwb

Rhode Island GIS

Data clearinghouse for the state of Rhode Island.
http://www.edc.uri.edu/rigis/

The DataStore

Offers downloadable digital GIS data and maps.
http://www.data-store.co.uk/

Geographic Data Technology

Digital map database compiler focused on the Americas.
http://www.geographic.com/

New York State GIS Clearinghouse

Operated by the New York State Office for Technology. Provides access to the New York State GIS Metadata and Data Repository.
http://www.nysgis.state.ny.us/

Community Cartography

An Internet mapping service and spatial data warehouse.
http://www.comcarto.com

The Climate Source

Distributor of spatial climate data developed by Oregon State University's PRISM mapping program.
http://www.climatesource.com/

National Spatial Information Framework - South Africa

Geospatial data infrastructure for South Africa.
http://www.nsif.org.za/

Metart

ARTEMIS and AGROMET data and information. Satellite images, meteorological data and related tools.
http://metart.fao.org/

Infoshare: Community Data on New York City

Profile and compare neighborhoods, and produce original tables.
http://www.infoshare.org/

The Data Depot

A catalogue of European mapping, geocoding and geodemographic data sets for use in GIS software.
http://www.datadepot.co.uk/

Colorado Office of Emergency Management: Cartography and Mapping

State and local government oriented GIS data.
http://www.dola.state.co.us/oem/cartography/cartog.htm

American Digital Cartography, Inc.

Providers of digital mapping data for use with CAD and GIS systems.
http://www.adci.com/

Census Watch

ESRI sponsored clearing house, providing information about US census tract TIGER data availability and modifications.
http://www.censuswatch.com/

Community Mapping Network

Created to share a wealth of natural resource information and maps with communities in British Columbia, Canada. Allows users to add data.
http://shim.bc.ca/

Geosign Corporation

Provides geographic data for franchises and yellow-pages listed companies.
http://www.geosign.com/

Go Spatial Limited

Producer of digital geographic data suitable for reference base mapping at global, regional or national levels.
http://www.gospatial.com

AUSIMAGE

Offers a series of high resolution, digital, orthorectified aerial imagery for use in areas such as advertising, planning and design and environmental monitoring.
http://www.ausimage.com.au

GIS Express

Offers satellite and aerial images.
http://www.gisexpress.com

Digital Data Technologies, Inc (DDTi)

Road centerline and address base mapping for GIS and E9-1-1.
http://www.ddti.net

Doyle's GIS Info Page

Information about GIS and Links to GIS site for mostly free data for the USA.
http://www.doylesdartden.com/gis/

@City Inc

iStreetView - 360-degree Geocoded Street level Imaging on the Web
http://www.atcity.com

3D landscape visualization for MAXON CINAMA 4D

Offers wire-meshes for the rendering software MAXON CINEMA 4D taken from the GTOPO30 dataset of the U.S. Geogical Survey. Also provide matched satellite images textures from NASA.
http://www.Digital-Landscape.com

Aerial photography and satellite imagery

Company sells 1 foot orthoimagery and LANDSAT satellite imagery.
http://www.landsat.com/ortho/index.html

TTI Production - Remote Sensing and Image Processing

Specific geographic databases compatible with the majority of the GIS of the market.
http://www.tti.fr/en/

Forest Spatial Information Catalog

The Forest Spatial Information Catalog (FSIC) is a central repository for forest related spatial metadata.
http://gislab.cifor.cgiar.org/fsic

National Geospatial Data Framework - United Kingdom

Geospatial data infrastructure for the United Kingdom. Runs the UK Standard Geographic Base.
http://www.askgiraffe.org.uk/

microDATA GIS

Spatial databases and enhanced 911 (E911) mapping and database solutions.
http://www.microdatagis.com

University Library Digital Spatial Data Catalog

Searchable catalog of data/metadata managed by Numeric and Spatial Data Services at the University of Michigan Library
http://www.hti.umich.edu/cgi/b/bib/bib-idx?g=gisall

Perfect SRTM Project

SRTM is a 90m-resolution global elevation database.
http://www.geocities.com/drgportugal/perfect/

Kansas Geospatial Community

State of Kansas Data access and support center (DASC). DASC catalogues, archives, and distributes databases with FGDC compliant metadata and direct FTP access.
http://gisdasc.kgs.ku.edu

Earthmaps

Data, travel maps, recreation, and earth science applications.
http://www.earthmaps.com/

USGS Geography

National mapping information from the U.S. Geological Survey. A good place to start the search for many kinds of GIS data.
http://geography.usgs.gov/

NOS Data Explorer

Offers interactive mapping tools that allow users to locate NOS products in any area in the United States and its territories through a metadata catalog.
http://www.noaa.gov

MASDEC GIS

Contain oceanographic data for the Straits of Malacca, Malaysia.
http://masdec.upm.edu.my/

Geospace

Provides spatial data services.
http://www.geospace.co.za/