Scientific

Irving Geis Screensaver
Contains images by a pioneer in molecular art who worked closely with biological scientists to reveal the beauty of nature. Windows and Mac.
http://www.hhmi.org/holidaygift/geis/screensaver/

Molecular Expressions
Feature photographs taken through a microscope. Includes amino acid, DNA and silicon zoo. A demo is available.
http://micro.magnet.fsu.edu/store/software/screensavers/index.html

Seti@Home
The program downloads and analyzes radio telescope data from the Berkeley Search for Extraterrestrial Intelligence.
http://setiathome.berkeley.edu/