Quick Jump: International , France ,U.K.,  United States

International

• ArcGIS.com: Worldwide online mapping. Includes World Topographic Map . ArcGIS Basemaps are now available for free online!
• ASTER GDEM: ASTER global digital elevation model (GDEM) is available for download from this stie.
• Bing Maps: Bing offers aerial photos and bird's eye view imagery for several areas around the world.
• Center for International Earth Science Information Network (CIESIN) : The Center for International Earth Science Information Network (CIESIN) is a center within the Earth Institute at Columbia University. CIESIN works at the intersection of the social, natural, and information sciences, and specializes in on-line data and information management, spatial data integration and training, and interdisciplinary research related to human interactions in the environment. GIS data in these areas is available for download.
• CEOCat: Catalogue of satellite images acquired by CCRS receiving stations since 1972 - organized by satellite/sensor - searchable by track/frame, lat/long, place name or NTS - primarily Canadian data - displays browse images and location maps - includes some image mosaics .
• CIA World Factbook - kml factbook uses Google Earth to display population, AIDS, Life expetancy and more.
• Data.gov - U.S. data catalogue. Free geodata available for download.
• Digital Elevation Models World Data Set (Raster), also known as DTED.
• DIVA-GIS - Free worldwide spatial data including administrative boundaries, roads, elevation, landcover and more. DIVA-GIS also is an open source software program for working with data.
• Earth Atlas: Allows users to upload KML data for use with statistical content, background imagery using Google Earth. Worldwide online mapping including fertility rates, GDP, Life expectancy and more.
• Earthquake Geospatial Research Portal :The Earthquake Geospatial Research Portal provides information on earthquakes that can be integrated and analyzed using GIS. It is available through Harvard University and is a free program which requires registration. This portal aims to study the impacts of earthquakes on local populations. The data is freely available in the hopes of speeding assistance to earthquake localities, supporting damage assessment and rehabilitation in areas affected by earthquakes, and providing a permanent archive of earthquake information.People are invited to contribute and revise information about earthquake zones, whether it be GIS datasets, photos or historical and demographic information, about past, present and future earthquakes. 
• ESRI online downloadable data, USA/World bundle, world street map, world imagery and maps available for download.  For mapping online go to:  ArcGIS online ( all of the basemaps are available online for free as well)
• ESRI licensed data: GIS data includes Europe, USA and World, also including thematic maps (persons per household, pop density etc) MUST BE ON CAMPUS TO USE
• European Environmental Agency: Data and Maps. - Access to European environmental datasets, maps, charts and applications.
• European Union, Geo Spatial Information Analysis for Global Security and Stability: Online resource for maps and data related to security, conflict, human settlement and other word issues.
•  GEO-STAT web mapping and data reporting: Géo-Stat combines statistics with mapping. Includes Canadian and USA maps with demographic data
• GeoCommons: GeoCommons Finder allows users to locate, import, export and mashup geodata. Maker allows users to create, publish and share spatial data.
• GeoCommunity Data Catalogue , some free data from around the world (must register).
• Global GIS Database , Part of the US Geological Survey digital data series, available on CD rom.
• Global Land Cover Facility - The Global Land Cover Facility (GLCF) provides earth science data and products to help everyone to better understand global environmental systems. In particular, the GLCF develops and distributes remotely sensed satellite data and products that explain land cover from the local to global scales.Primary data and products available at the GLCF are free to anyone via FTP. Online datasets may be accessed electronically through the Earth Science Data Interface (ESDI).
• Global Mapping International - GIS products: Digital chart of the world, world language map, religion mapping and more.
• Google Mapping : Google Earth: Free software for creating maps and analyzing data. Universty has an educational license for Google Earth pro, contact the GIS librarian for information. Google Maps: Includes streetview, ability to create 'my maps', share maps and more. Google Earth Library: This site showcases add-on content for Google Earth as well as free data (not owned by Google).
• Landsat Mosaic: World Data Set (Raster)
• Map My Run : Create and share maps of where you've run or would like to run.
• MapCruizin: Free GIS software and resources for locations around the world.
• National Snow and Ice Data Center : Data sets include the atlas of the cryosphere, sea ice index, vegetation map and more.

NASA

• NASA Imagery in Google Earth: NASA's Goddard Earth Sciences Data and Information Services Center established this portal which provides access to NASA imagery downloadable as KML files for importation into Google Earth.
• NASA World Wind - Free online interactive globe that allows viewing of landsat satellite imagery and shuttle radar topography. The globe includes SRTM elevation data, Blue Marble, Land Sat 7 imgery, placenames, borders and more.  Also has access to download free imagery.  
• Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC) - Archives NASA data, and makes it available for downloading. Various geospatial datasets are available including AVHRR, Imagery, Erosion, Ecomaps, Landcover, Climate, STRM DEMs, and more.

• Natural Earth: Free worldwide data at 1:10, 1:50 and 1:110m. You can also use the Natural Earth Web Browser to view available maps online.
• North American Environmental Atlas - This website is provided by the Commission for Environmental Cooperation of North America, a joint project between environmental authorities from Canada, Mexico, and the United States. They provide this free online atlas as a tool for analysis of environmental data in North Americaupon which many different layers of environmental-related data can be layered. Main categories include Terrestrial Ecosystems, Marine Ecosystems, Pollution and Waste, and Human Influence. One can use the map to view data such as basic physical features and infrastructure, designated ecoregions within North America, protected and priority conservation areas, natural ranges of various species of concern, nighttime light pollution, and more. It is a useful resource for anyone researching ecosystems of North America and human impact upon the environment. Access is provided free of charge, maps can be downloaded in a variety of different formats, and data is integrated with Google Earth Viewer.
• OpenStreetMap: This is a free editable map of the whole world. Users can view, edit and use geographical data collaboratively.
• OneGeology Portal :   Through GeoNetwork, OneGeology offers interactive mapping and geological map data covering the globe.
• Online Soil Survey Information : From ITC, covers worldwide sources for Soil Survey Information around the world.
• ShareGeo Open : ShareGeo Open is a spatial data repository in the UK. Data includes boundaries, biota, coastlines, crime and more.
• Shuttle Radar Topography Mission (NASA) - The Shuttle Radar Topography Mission (SRTM) obtained elevation data on a near-global scale to generate the most complete high-resolution digital topographic database of Earth.
• Socioeconomic data and applications center - Access to Geographic Data and Data Resources-  links to several online GIS sources
• Timezones of the world: shapefile available online

United Nations

• Aquastat - Food and Agriculture Organization of the United Nations. Spatial data, maps and tables related to water resources.
• United Nations Institute for Training and Research: Operational Satellite Applications Programme. - Delivers imagery analysis and satellite solutions to relief and development organizations. View current maps of world emergencies and issues.
• Harmonized World Soil Database v.1.1 - The Land Use Change and Agriculture Program of IIASA and the Food and Agriculture Organization of the UN have developed a comprehensive Harmonized World Soil Database which includes volumes of recently collected regional and national updates of soil information. Must download the free database to use. The data is incredibly useful for planning sustainable expansion of agricultural production to achieve food security and provides information for national and international policymakers in addressing emerging problems of land competition for food production, bio-energy demand and threats to biodiversity.
• United Nations Refugee Agency : Maps - includes UN google earth layer of refugees, and other online maps.

• USGS Earth Explorer -  Access to Aerial photography, AVHRR, Digital Elevation, Digital Line Graphs, Digital Maps, Forest Carbon Sites, Global Land Survey, Landsat Archive, and Radar Imagery. This data is made available from the United States Geological Survey's Earth Explorer. This data would be useful for anyone interested in the geological aspects of the United States such as structural mapping of geological formations, and topographic mapping. As well as creating maps involving mineral resource information. This data is freely available to the general public. Restrictions involving commercial satellite images of certain sites are licensed only for U.S. users.
• LP DAAC (Land Processes Distributed Actiev Archive Centre) :Includes from all NASA centres. See links below for more specific data sets.
•   Global Data Explorer (USGS, NASA):   Aster Global Digital Elevation Model (GDEM). Search and select geographic area of interest or predefined region, repormat and download.
• USGS GTOPO30 : GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds. It is available for free online.
• Data Pool: publicly available portion of the LADAAC holdings. MODIS data and ASTER data available via ftp.

• Vector Map Level 0, Also known as VMAPO. Digital world map, scale 1:1,000,000. Horizontal datum: VGS84, Vertical datum: mean sea level.
• Wikimedia Commons- Atlas - Collection of geographical, political and historical maps available online.
• World Freedom Atlas: A geovisualization tool for world statistics. Designed for Social Scientists, NGO workers, and others who wish to have a better understanding of issues of freedom, democracy, human rights and good governance. Covers 1990-2006.
• HealthMap - Interactive map containing information concerning disease outbreaks and health warnings worldwide. The data is freely available and easily accessible. It is a very useful and interesting service for anyone interested in the location of disease outbreaks.
• National Geographic - The World's Freshwater: Online mapping of the world's freshwater including: Permafrost, Glaciated area or ice sheet, Rivers and lakes, Wetlands and Groundwater.
• Sea-Seek -  Here Sailors, Boaters, Crew, Surfers or sea lovers from around the world can share information about anchorages or surf spots, marinas and services in their area to create the "Sea-Seek" boating resource.Sea-seeks GIS data is useful for both locals and tourists. Data available includes a world map (Google Earth) and information such as photos and advice.
• World Health Organization - Public Health Mapping and GIS The World Health Organization's Public Health Mapping and GIS tools, such as HealthMapper, The Global Health Atlas, and Remote field data collection tools in combination with a Google Maps power  HealthMap, which "brings together disparate data sources to achieve a unified and comprehensive view of the current global state of infectious diseases and their effect on human and animal health" provide significant statistical analysis of cartographic and database data sets regarding local health, that could improve global health.
• World News Atlas - Daily news linked to world map.
• ZoomProspector - ZoomProspector allows businesses to decide where to locate based on certain criteria. 

France

• GeoPortail: Web mapping service of the French government. Users can view high resolution images of locations throughout mainland France and its territories.

United States of America

• EPA Data - This website lists access points to the Environmental Protection Agency's available GIS data. For data from the WATERS (watershed assessment, tracking & environmental results) click here. For the BASINS 4.0 open source software click here.
• Federal Government's Geospatial Platform : Explore featured maps and apps from all levels of government, create maps you can view anywhere.
• National Atlas.gov (US) - The data is available from the United States Department of the Interior. This map viewer gives you the ability to work with interactive maps and combine layers such as:agriculture, biology, boundaries, climate, environment, geology, history, map reference, people, transportation and water. Also available are printable maps, wall maps and dynamic maps.The data is freely available.
• Natural Hazards Support System - The GIS data available is information on all the natural hazards affecting areas in the United States. Interactive mapping of floods, volcanoes, earthquakes, hurricanes, wildfires and weather watches. All of this information is made available from the United States Geological Survey. 
• TOXMAP - Explore toxic releases and hazardous waste sites within the USA, interactive map.
• USDA- CropScape: Cropland Data Layer from 1997 + from the USDA on an online mapping system.
• United States Department of Justice - Regional Crime Analysis: This software is able to assist the assesment of crime on a regional basis; it can be used to map incident locations and general patterns of crime across jurisdictions.  The data is freely available.
• U.S. Census Bureau - 2009 TIGER/Line shapefiles, May 2009 extracts containing geographic and cartographic information from the Census Bureau database. Digital map base, boundaries for legal entities, spatial data such as roads, rivers, etc.
• U.S. Census Bureau: Geography - Includes TIGER/Line Shapefiles, 2010 Census Geographic Products, LandView 6, Maps and Map resources and more. American Community Survey Maps. 
• USGS- Seamless Data Warehouse  : Access to Orthoimagery, Elevation data and Landcover from the USGS. Can also download their ArcGIS toolbar application.
• USGS - The National Map : Includes the National Atlas which includes agriculture, biology, climate, water and more (for raw data download page click here) ; US Topo - digital topographic maps of the USA;  and The National Map Viewer which allows users to create maps online and download.

 U.K.