- Directory of Open access Books (DOAB)
- IntechOpen
- Project Muse
- National Academic Press
- Brill Books
- Book Boon
- Online Programming
- IOS Press
- MDPI Books
- CABI Books
- Project Gutenberg
- Open Textbook Library
- Open Access books on JSTOR
- Springer Open access books
- Cambridge University Press
- HathiTrust
- Open Library
- Internet Achieve
- MIT Press
- OAPEN
- Oxford University Press Open Access Book titles
- Taylor & Francis Open Access Books – Routledge
- Open Access Scholarly Publishing Association
- CORNELL OPENA Global Open Access Portal
- KARGER
