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| American Field Guide | Oregon Public Broadcasting. >1400 video clips on animals, ecosystems, human history, livelihoods, earth and space, plants, public policy, and recreation. |
| Chemical and Biological Disarmament | University of Michigan, Susan P. Wright. Annotated links to sites concerning all aspects of the subject. |
| Cold Regions Bibliography | Library of Congress. Over 220,000 bibliographic citations. |
| Constants and Equations Pages | Providing comprehensive sources for information on constants and equations, as well as much, much more. There are currently over 10,800 pages of information. |
| Convert Me | Sergey and Anna Gershteins. Interactive calculators for a wide variety of measurement systems. |
| Einstein Archives | 900 scanned documents. |
| EurekAlert | Indexes research advances in science, media, health, and technology. News releases, links, bibliographies, etc. |
| Exploring the Nanoworld | University of Wisconsin. Articles, links, videos, lesson plans, etc. |
| Federation of American Scientists | Essays and analyses regarding research and education projects in nuclear arms control and global security; conventional arms transfers; proliferation of weapons of mass destruction; information technology for human health; and government information policy. |
| Fundamental Physical Constants | National Institute of Standards and Technology. The 1986 CODATA Recommended Values of Fundamental Physical Constants. With updated technology in nuclear physics, physical constants, and the elemental data index. |
| Internet History of Science Sourcebook | Fordham University. Many links arranged in categories primarily of chronological periods, from ancient times to about 1900. |
| ISI HighlyCited | Institute for Scientific Information. Listing of top cited researchers in chemistry, engineering, neuroscience, and physics, with biographical information, listings of all publications, and additional bibliographical links. |
| Molecular Expressions | Florida State University. Hundreds of photomicrographs with brief descriptions. |
| Science.gov | Gateway to selected science information provided by U.S. Government agencies, including research and development results. |
| ScienceResearch.com | Search for materials in the topics of astronomy, biology, chemistry, computers, environmental sciences, engineering, health and medicine, materials science, mathematics, physics, and social sciences. Also includes links to related sites. |
| Scirus | Searches >167 million science web pages and 18 million fulltext articles and abstracts. |
| SciTechResources | Descriptions of and links to government web sites that are key entry points to government science and technology resources. |
| Thomas Register | Specifying and buying guide of industrial companies, products and services. |