The Open Textbook Library

  

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Open textbooks are textbooks that have been funded, published, and licensed to be freely used, adapted, and distributed. These books have been reviewed by faculty from a variety of colleges and universities to assess their quality. These books can be downloaded for no cost, or printed at low cost. All textbooks are either used at multiple higher education institutions; or affiliated with an institution, scholarly society, or professional organization.

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See also:
Open school solutions (Hardware/Software)
  
Openstax

A revolution in education

OpenStax breaks down barriers to knowledge and education with its free, high-quality, openly licensed textbooks integrated with personalized learning technology. And it advances students’ learning outcomes while conducting foundational research on how students learn through their use of machine learning.

OpenStax is nurturing a ‘learning generation’ of students and teachers. Their mission to create equity in education and conduct unprecedented research on the human mind and how it learns will catalyze a new, more effective way to educate students everywhere.


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OpenStax (Wikipedia)
  
via  @Manuel (thanks)

Remember Cheech and Chong?Remember Cheech and Chong? wrote the following post Thu, 02 Jan 2020 04:53:08 +0100
A NEW SOURCE OF INSPIRATION HAS BEEN OPENED UP
Yipee! TODAY IS PUBLIC DOMAIN DAY. That means works from 1924 will enter the US public domain, where they will be free for all to use and build upon, without permission or fee
https://web.law.duke.edu/cspd/publicdomainday/2020/