Dowser
Clusters results from major search engines, associates words that appear in previous searches, and keeps a local cache of all the results you click on in a searchable database. It helps keep track of what you find on the web. [Windows, UNIX, Linux and Mac OSX.]
http://dowser.sourceforge.net/

Wybron Inc.
Manufacturer of color changers, gobo changers, dowsers, and an automated follow spot system.
http://www.wybron.com/

George Applegate Water Diviners
Expert Water Diviners/Dowsers. Underground water locators for businesses.
http://www.george-applegate.co.uk/