~ Free to users because built-in advertising is no more than 15% of the e-textbook.
~ Undergrad as well as graduate level textbooks.
~ Main focus is business and economics, engineering and natural sciences and IT.
~ Approximately 800 free e-Textbooks in 7 languages. Source
~ Available in PDF format only.
~ Author credentials explained in "About the Author" section
~ Supplemental materials provided with some texts
Bookboon offers over 800 free e-books in seven languages. All books are downloadable in PDF format, and each book has a nifty embed code that can direct users to download the book.
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