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