GIS: Geographic Information Systems

Information portal with introductory texts on GIS.

Portal that includes GIS news, training, job postings, and more.

This article from Syracuse's iSchool lists several open source GIS tools and provides inspiration in using GIS data.

IPUMS provides census and survey data from around the world integrated across time and space.

Natural Earth is a public domain map dataset available at 1:10m, 1:50m, and 1:110 million scales.

Over 115,000 open datasets hosted by ArcGIS.

The U.S. Geological Survey's EarthExplorer gives you access to one of the largest databases of satellite and aerial imagery.

Coarse global free GIS data all about human interactions with the environment.

Provides a portal to high spatial resolution topographic data and tools. Includes LiDAR data.

OpenStreetMap is the wikipedia of mapped data sets.

Can't find the data your looking for? Check out librarians Dawn Behrend's guide on finding data and statistics.

SimplyAnalytics is a mapping, analytics, and data visualization application that makes it easy for anyone to create interactive maps and reports using thousands of demographic, business, and marketing variables.

Sign up for a free trial of Tableau, a data mapping software.

A free, open source GIS software that allows you to create, edit, visualise, analyse and publish geospatial information on Windows, Mac, Linux, BSD (Android coming soon).

Connect people, locations, and data using interactive maps. Work with smart, data-driven styles and intuitive analysis tools. Share your insights with the world or specific groups.

An article that ranks and describes 13 different free GIS software options.

GIS blog with helpful resources run by Nicholas Duggan.

Articles, webinars, and geospatial news from an Esri publication.