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Readcube is a free, simple, academic software and reference manager for researchers. Read Cube helps researchers organize, annotate and stay on top of new research literature.

Search and preview millions of books from libraries and publishers worldwide using Google Book Search. Discover a new favorite or unearth an old classic.

Choose from more than 100 million new & used books, used textbooks, and rare, out-of-print books from over 8,000 independent book stores around the world.

LibraryThing catalogs your books online, easily, quickly and for free.

AbeBooks is your source for Used, New, Rare and Out of print books. Find classic collectibles, rare signed editions, used textbooks, and inexpensive bestsellers from independent booksellers worldwide.

Find what you want in a library near you with WorldCat, a global catalog of library collections.

Aggregates information on biology, agriculture, horticulture, forestry, geography, the environmental sciences, and the health sciences

TrafficEstimate.com profiles millions of websites providing traffic statistics, web analytics, keyword and competitor analysis, contact information, and more.