Athenus - Athenus is an authority on science and engineering on the Web, sharing a directory and full-featured web search

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Analytical Sciences Digital Library - peer-reviewed, web-based educational resources in analytical sciences, featuring a variety of formats for techniques and applications

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Biology Browser - From BIOSIS. Great for systematics, plant and animal. Includes search engine for Zoological Record

Biology Browser

CERN Document Server - great search and directory for experiments, archives, articles, books, presentations, and so much more within their documents

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Chem BioFinder - Register with PerkinElmer to check out the Chem BioFinder and look up information about chemicals, including their properties and reactions

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SciCentral - A literature search, journals, databases, and other great tools for finding what you need

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Science.gov - search more than 50 databases and 2,100 selected websites from 12 federal agencies

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SciSeek - The best of what Science has to offer - Browse by category, search by keyword, and even add new sites to the listings

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Strategian - free full-text books, patents, and reports, as well as full-text journal and magazine articles, plus a special collection of Vintage Biology with important articles and books in biology

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WorldWideScience - a global science gateway, offering excellent search results in the sciences, and even the option to select specific databases and find resources in your own language

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