USGS Global Visualization Viewer
Here you can view or download recent Landsat images of most of the world.

Topozone.com
View or download topographical maps for the entire United States.

Terraserver
View or download aerial photographs for the entire United States.

GlobeXplorer
View or download aerial photographs for the entire United States.

Earthshots
Examples of environmental change shown by satellites images.

Landsat Images and Applications
A collection of satellites images and examples of their use.

Remote Sensing Tutorial
This site is designed to educate people about satellite imaging and its applications.

Earth Resources Observation Systems (EROS) Data Center
Receives, processes, and distributes data from National Aeronautics and Space Administration (NASA) Landsat satellites.

Third From The Sun
Geographical features as seen from space.

ImageJ
A free image processing program written in Java.

MultiSpec©
MultiSpec (©Purdue Research Foundation) is a processing system for interactively analyzing Earth pictures from outer space.