These are dedicated open access publishers of open books
These free, open source tools can all publish/export content as PDF files or ePub3 eBooks. Some are based upon or utilize LaTex typesetting base code.
LaTex (Typesetting code. Site offers LaTex editor recommendations)
Self-Publishing Guide, by Lauri M. Aesoph. A reference for individuals or groups wanting to write and self-publish an open textbook. This guide provides details on the preparation, planning, writing, publication, and maintenance of an open textbook.
A Guide to Making Open Textbooks with Students Edited by Elizabeth Mays. A handbook for faculty interested in practicing open pedagogy by involving students in the making of open textbooks, ancillary materials, or other Open Educational Resources.
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