DOAB : The primary aim of DOAB is to increase discoverability of Open Access books. Academic publishers are invited to provide metadata of their Open Access books to DOAB. Metadata will be harvestable in order to maximize dissemination, visibility and impact. Aggregators can integrate the records in their commercial services and libraries can integrate the directory into their online catalogues, helping scholars and students to discover the books. The directory will be open to all publishers who publish academic, peer reviewed books in Open Access and should contain as many books as possible, provided that these publications are in Open Access and meet academic standards.
DLA : (Digital Library and Archives) DLA provides access to scholarly electronic serials that are peer-reviewed, full text, and accessible without charge. Their topics range from education, engineering, and literature to technology, philosphy and libraries. Most titles are available in both PDF and HTML.
PDF SB : On this site you can read and download free books online in pdf format. It's database covers an extensive array of pdf books in different languages that describe all types of subjects and topics. For those who're looking for free e books online, this site has made it easier for readers to search for what they want, through their built-in search engine and the additional filters. After typing the search engine keywords, you can also filter the size of the downloadable book, the page count and the language so they can trim down the results to fit what they’re actually looking for.
ScienceDirect : ScienceDirect is a leading full-text scientific database offering journal articles and book chapters from more than 2,500 journals and almost 20,000 books.
E-books Directory: E-Books Directory is a free web resource which contains links to free downloadable e-books, technical papers, documents, as well as user contributed content, articles, reviews and comments. E-Books Directory is a service to students, researchers and e-book lovers. E-Books Directory does not support copyright infringement, nor will it link to web sites that trade copyrighted material. If you find a questionable link on this web site, please contact the webmaster. The site is launched in 2008, it is a database-driven web site using PHP scripting language and MySQL relational database. There are currently 8801 e-books listed in 652 categories.