The Tufts Geospatial Data Repository allows you to search, discover, preview, interact with the map, and retrieve geospatial data from university repositories.
ArcGIS data server, including a number of world, US, and US state data sets that can be brought up directly in ArcGIS (click on a data set and if you have ArcGIS, it will open the program; alternatively, in ArcGIS, click on File – Add Data From ArcGIS Online)
Curated catalog of links to geospatial data sites.
Digital, georeferenced historical maps. Focus on rare 18th and 19th century maps of North and South America, although it also has maps of the World, Asia, Africa, Europe, and Oceania.
Earth Resources Observation and Science Center. Great source for U.S. topographic data and international DEMs.
An open repository of data and maps for the world built by a public community of GeoIQ users.
Hosts U.S. federal, state, and local geographic maps and data and serves as a GIS data clearinghouse. Includes many data sets and services formerly published to Geography Network. In addition, Data.gov has integrated the Geospatial One-Stop (GOS) portal and catalog, and added some exciting improvements to both the user interface as well as the underlying infrastructure.
Spatial Data Infrastructure Links: list of portals by scale.
Provides free and charged GIS data downloads and creates custom GIS data CD-ROMs for CAD, mapping, and location based applications.
A guide to Tufts Haiti Geospatial Data Repository and for Online Haiti Geospatial Data repositories.
Free Digital Chart of the World (DCW) data and historic maps.
Free VMAP1 international data.
Great site for state-wide data resources.
GeoData@Tufts allows you to search, discover, preview, interact with the map, and retrieve geospatial data from university repositories.
The Big Ten Academic Alliance Geoportal provides discoverability and facilitates access to geospatial resources, including GIS datasets, web services, and digitized historical maps.