Google Scholar - Stand on the shoulders of giants (Tracking is 'free')

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Indiana University - Digital Library of the Commons

Check out the DLC to find international literature including free and open access full-text articles, papers, and dissertations.

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Infomine - UC Riverside LIbrary

The Infomine is an incredible tool for finding scholarly Internet resource collections, especially in the sciences.

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Internet Public Library

Find resources by subject through the Internet Public Library’s database.

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Microsoft Academic Search

Microsoft’s academic search engine offers access to more than 38 million different publications, with features including maps, graphing, trends, and paths that show how authors are connected.

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More links on Cyclopaedia Universalis – Academia