OAPEN: Open Access Publishing in European Network
OAPEN is a very wonderful resource for open access books. It contains freely accessible books on society and social science, humanities, Economics, Finance, Business, Management, Law, Art, Language & Literature, Earth Science, Geography, Environment and Plannings.
The OAPEN Foundation is a non-profit foundation dedicated to Open Access publishing of academic books. OAPEN provides a platform for the full text dissemination of Open Access books and provides services to publishers and libraries. OAPEN builds a quality controlled collection of Open Access books and develops services for publishers, libraries and research funders in the areas of dissemination, quality assurance and digital preservation.
To search the OAPEN online library follow the link