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Open Textbook Initiative(external link)
Provides access to books and journals published by institutions, mainly Australian Universities, which are members of this collective. The Australian National University(external link) has the largest collection of books.
Open Textbook Library(external link)
A collection of freely downloadable textbooks are available from this link.
Taylor and Francis eBooks(external link)
Taylor and Francis group, which includes imprints like Routledge, Dove Press, Cogent OA, has an eBook collection of more than 1100 titles. It covers subject areas ranging from Social sciences to STEM disciplines.
An open text book collection by Wikimedia Foundation. Following the Wikipedia tradition, anyone can edit these books.