List of current open access titles is at the bottom of the page. All are published under the Creative Commons Attribution-Non Commercial-No Derivatives 3.0 license.
"The SPO Scholarly Monograph Series is an interdisciplinary collection of original, open-access scholarly monographs and essays published by the Scholarly Publishing Office of the University of Michigan Library."
Lists open Access reprints from Michigan Publishing available online (at HathiTrust) or for purchase from Amazon.
Textbooks for Arabic courses (all levels, some specific to regional varieties) account for the bulk of the list. The remaining books are a mix from fields including psychology, political science, health sciences, and business management.
web platform for books in the humanities and social sciences. More than half of them is available in Open Access. Additional services are available through subscribing libraries and institutions.