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)
  
elmussolelmussol wrote the following post Wed, 29 May 2019 12:55:01 +0200
things of beauty
The Public Domain Review is a constant source of joy and interest. Enjoy, as I did today, with my morning coffee:

Plants and Their Application to Ornament (1896).

#publicdomainreview
  
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1,600+ MOOCs (Massive Open Online Courses) Getting Started in October: Enroll Today (2019, openculture.com)
Complete list of October MOOCs

Here's one tip to keep in mind: If you want to take a course for free, select the "Full Course, No Certificate" or "Audit" option when you enroll. If you would like an official certificate documenting that you have successfully completed the course, you will need to pay a fee.


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Massive open online course (Wikipedia)