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- OpenStax: Free and Flexible Textbooks and Resources https://openstax.org/ 22 comments
- OpenStax – openly licensed textbooks https://openstax.org/ 55 comments
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- OpenStax: free, peer-reviewed textbooks https://openstax.org/ 9 comments book , math , science
- OpenStax | Free Textbooks Online with No Catch https://openstax.org/subjects/science 16 comments internetisbeautiful
- Openstax - A website which contains free, peer reviewed and openly licensed high school/university level textbooks in various subjects including Math, Science, Economics, Finance, Accounting and more. https://openstax.org/ 6 comments internetisbeautiful
- Openstax makes open licensed textbooks https://openstax.org/ 9 comments opensource