The Directory of Open Access Books (DOAB) is a service of OAPEN Foundation and operates as a discovery service for open access books. 

DOAB launched in 2015 and currently has 4035 Academic peer-reviewed books from 135 publishers.

In 2015, DOAB won the  IFLA/Brill Open Access Award. This award was created in 2013 to recognise initiatives in open access monograph publishing and in 2015 DOAB was recognised as the most outstanding and game changing initiative in this field.  Research has shown that OA books listed in DOAB receive almost twice as many downloads as unlisted books.

You can search and browse to discover content. You can browse by title, subject or publisher. You can search across a range of fields including: title, ISSN/ISBN, publisher, author, keywords and abstract. You can also limit your search by publication year.

Brief bibliographic information is provided plus links through to the open access books on publisher websites. Licence information is also clearly flagged for each item as in the example shown below.