Open Textbooks (OTB) Projects
| North America | |
| Canada | The British Columbia Open Textbook Project http://open.bccampus.ca/ |
| The United States | Boundless Open Textbooks https://www.boundless.com/ |
| California Free Digital Textbooks Initiative http://www.clrn.org/fdti |
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| CK-12 http://www.ck12.org/student/ |
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| College Open Textbooks http://collegeopentextbooks.org/ |
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| Connexions http://cnx.org |
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| Flat World Knowledge http://www.flatworldknowledge.com |
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| Open Access Textbooks http://www.openaccesstextbooks.org |
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| Project Gutenberg http://www.gutenberg.org/ |
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| Writing Commons http://writingcommons.org/ |
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