- Botanicus
 - Explore Botanicus, the web-based encyclopedia of historic botanical literature from the Missouri Botanical Garden Library. - Encyclopedia of Astronomy and Astrophysics
- Articles covering cosmology, galaxies, interstellar medium, stars, the solar system, space missions, theoretical concepts, and more. Subscription required.
- Encyclopedia of Life
- Encyclopedia of Life is an ecosystem of web sites that makes all key information about life on Earth accessible to anyone, anywhere in the world.
- Eric Weisstein's World of Science
- Comprehensive online encyclopaedias of astronomy, math, physics, scientific biographies, and scientific books, with many equations and formulas.
- Extreme Science
- Ever wonder what the biggest, baddest, and the best are in the natural world? Check out these world records and meet some of the scientists who are studying this stuff.
- GalaxyGoo
- Collective of scientists with a mission to present mathematical and chemistry experiments online in a dynamic and interactive way.
- HowStuffWorks Science Channel
- Describes how natural phenomena and technological processes work. Covers topics in engineering, aerospace, biology, earth science, astronomy, and physics.
- Jones Encyclopedia of Media & Technology Information
- Features articles on a variety of topics on the history, innovations, milestones, pioneers, and legal trends that shape the world of media, information technology, telecommunications, and broadband.
- Nature Encyclopedia of Life Sciences
- Reference resource for the biological sciences. Subscription required.
- Open Questions
- Designed to organise scientific information around a number of fundamental open questions, questions that motivate leading edge basic scientific research.
- Scientific Commons
- Provides access to scientific publications across disciplinary, institutional, and technological boundaries. From the University of St.Gallen and the Institute for Media and Communications Management.
- The Science Portal
- Find selected Wikipedia articles, photographs, and categories addressing the major branches of scientific study: agronomy, astronomy, biology, biotechnology, chemistry, earth science, medicine, physics, and psychology.
- Whatiscience.com
- An overview of science ranging topics in aerospace, biology, physics, astronomy, and earth science.
- Windows Live Academic
- An academic search that enables you to search for peer reviewed journal articles. Windows Live Academic is currently indexing content related to computer science, physics, electrical engineering, and related subject areas.
- World Book @ NASA
- Index of encyclopedia articles about the Earth's geology and atmosphere, the planets, celestial objects, astronomers, space missions, and other astronomy topics.
- Yahoo! Kids Science
- Science news, informative movies, and dinosaurs.
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