We’ve heard for years about the invisible, hidden, deep or dark web — that portion of the web that resides in databases and other formats not accessible to search engine spiders. One of the latest attempts to make this content searchable isDeepDyve, formerly known as Infovell.

DeepDyve offers a federated search of a wide variety of content, some of which is free and some requires payment to the publisher. Sources include MEDLINE, Clinical Trials, PubMed Central, BioOne and SAGE Publications – some heavy-hitters. Searchers can limit their search to various slices of this content, such as legal, business & finance, life sciences, or clean tech and energy.

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