AMS: American Mathematical Society Authorama: Public Domain Books CSKC: Civil Society Knowledge Centre DOAB: Directory of Open Access BooksDOAJ E-Books Directory FreeComputerBooks.com GALLICA Goodreads Internet Archive Islamic Philosophy Online OAPEN: Online library and publication platform OATD: Open Access Theses and Dissertations Open Knowledge Repository Open Research Library (ORL) ScholarVox by Cyberlibris The Digital Library of the Middle East (DLME) The Online Books Page Yale University Library المجموعات العربية على الانترنِت - Arabic Collections Online (ACO) شبكة المعلومات العربية التربوية مكتبة الشيعة - Shia Online Library مكتبة نور مؤسسة هنداوي
Supported by 