See OER - Open Education link for other major collections of open (free) learning and teaching resources.
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A new approach to textbooks in a world of open curricula, academic sharing and super easy digital publishing.
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Smarthistory.org is a free and open, not-for-profit, art history textbook.
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Free (open) textbooks organised by subject.
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A place to view and share educational material made of small knowledge chunks called modules that can be organized as courses, books, reports, etc. Anyone may view or contribute.
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A Wikimedia community for creating a free library of educational textbooks that anyone can edit. All subjects.
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Free learning resources submitted by schools and universities. Good Australian content. Books, notes, videos, podcasts.
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Customizable, standards-aligned, free digital textbooks for K-12 - science, technology, engineering & mathematics
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Find free-to-use teaching and learning content from around the World. K-12 Lessons, College Courses, and more.
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Python for Software Design is a concise introduction to software design using the Python programming language. Intended for people with no programming experience, this book starts with the most basic concepts and gradually adds new material.