IntechOpen is the world's leading publisher of Open Access books built by scientists, for scientists. Read, share and download more than 5, 600 peer-reviewed Open Access books in various subjects such as Physical Sciences, Engineering and Technology, Life Sciences, Health Sciences and Social Sciences and Humanities.

OAPEN promotes and supports the transition to open access for academic books by providing open infrastructure services to stakeholders in scholarly communication. We work with publishers to build a quality-controlled collection of open access books and provide services for publishers, libraries, and research funders in the areas of hosting, deposit, quality assurance, dissemination, and digital preservation.

DOAB is a community-driven discovery service that indexes and provides access to scholarly, peer-reviewed open access books and helps users to find trusted open access book publishers. All DOAB services are free of charge and all data is freely available.

De Gruyter Open Access offers a wide variety of peer reviewed open access journals and ebooks in various subjects such as Business, Engineering, and Humanities.

The Open Research Library (ORL) includes Open Access books covering various subjects, such as architecture, art, engineering and technology, business and economics, computers, law, and many more.

This database covers various subjects such as architecture, engineering and technology, energy and energy conversion, and transportation and infrastructure. Most of the ebooks and ebook chapters in this database are available for free.