- 100 Top Science Sites
 - Science page of the website 100.com - Argus Clearinghouse: Science & Mathematics
- Directory of science sites rated for content and design.
- AtomDir
- Family friendly science and technology web directory. AtomDir offers free and paid advertising for quality science web sites.
- Buzzle.com: Science and Technology
- Offers resources, information, and articles related to science and technology.
- Connotea
- Free online reference management service for scientists to store or share articles and links.
- Hypography.com
- A collection of user-submitted science and technology links.
- PSIgate: Physical Sciences Information Gateway
- Offers access to on-line resources in the physical sciences: astronomy, chemistry, earth sciences, materials sciences, physics, and general science.
 Scenta
- Works with leaders in the science, engineering, and technology (SET) world to provide a gateway to the best SET resources on the Web.- SciCentral
- Links to sites in the fields of science, medicine, and engineering, and to current scientific news articles.
- Science.gov
- Searchable gateway to authoritative science and technology information provided by U.S. government agencies, including research and development results. Part of FirstGov.
- Science.komm
- Offers a directory of bioscience and medical resources, including journals, publishers, and reference sources.
- Sciencepost.info
- Searchable web directory in a number of languages.
- Scientific American Sci/Tech Web Awards (3)
- SciNet
- Science and technology search engine with science articles and consumer electronics reviews.
- Scirus
- Searchable directory of scientific information. Provides access to web listings and articles from journal sources.
- Skowronski's Science Connection
- Points to biology, chemistry, and physics resources as well as science education sites for teachers and students.
- TechExpo
- A directory of technology and engineering sciences.
- Uzbekistan Science Network
- The scientific and educational network of Uzbekistan.
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