Wikibooks hosts user-written textbooks licensed under Creative Commons Attribution-ShareAlike, and is hosted by Wikimedia Foundation (the same non-profit that hosts Wikipedia and other sister projects). Books can be downloaded in printed form or ordered online from PediaPress (which WMF has a partnership with) or a third party.

Wikibooks and Wikiversity host textbooks and lectures, respectively, licensed under Creative Commons Attribution-ShareAlike.

They are hosted by Wikimedia Foundation, the same non-profit that hosts Wikipedia and other sister projects. 

Books and lectures can be downloaded in printed form or ordered online from PediaPress (which WMF has a partnership with) or a third party.