open textbooks are licensed under the open copyright license. Textbooks are made available online to be freely used by students, academics, and members of the public.
a global eBook publisher, which offers a wide range of over 1000 eBooks in seven languages, available for downloads from the website.
Global Text Project are released under Creative Commons Attribution 3.0 License. The aim is to make textbooks available to many who cannot afford.
Open Textbook library is a project
of the University of Minnesota, a collection which features reviews written by academics.