These e-book gateways are freely available on the Web. Generally, full-text is only available for older titles that are no longer covered by copyright. Partial access, or limited previews, may be available for newer titles.
Search the full-text of millions of books. Use as a "discovery" tool to find books on your topic. Books in the public domain (generally, pre-1923) are available full-text. Newer books offer limited viewing--from many pages to nothing.Note: This is just for books (and some magazines). To find scholarly articles, use Google Scholar.
NAP publishes reports from the National Academy of Sciences, the National Academy of Engineering, the Institute of Medicine, and the National Research Council. You can download FREE PDFs for more than 4,000 books. Browse the topics in the left-hand menu.
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More than a million free, online e-books. Read many books online, or create a free account and "borrow" some books for 2 weeks by downloading them. The goal of the project is to have a "web page for every book ever published."
Project Gutenberg is the first and largest single collection of free electronic books. They offer about 30,000 free, online books. Due to copyright restrictions, most of these are older, "classic" texts.