Free Digital Libraries
- Project Gutenberg Library - Provides free public domain books.
- Open Library - Contains millions of free e-books.
- Internet Archive - Includes historical documents and academic research.
- HathiTrust Digital Library - Focuses on academic and historical materials.
- PDF Drive - Offers millions of free e-books.
- World Digital Library - Contains global historical documents.
- Directory of Open Access Books (DOAB) - Provides free academic books.
- Free eBooks - Offers diverse e-books.
- Cambridge Core Free Resources - Provides free books and research.
- Bookboon - Offers free academic books.
- Springer Open - Contains open access academic books.
- Al-Shamila Library - Includes Arabic books on history and politics.
- ManyBooks - Provides free e-books.
- DigiLibraries - Offers e-books on multiple subjects.
- Library Genesis - Grants access to millions of books and research papers.
- Oxford Open - Provides open access books and articles.
- National Academies Press - Offers free research publications.
- SciELO Books - Focuses on academic books.
- Internet Public Library - Provides free social science resources.
- Arab World Books - Contains free Arabic books.
- University of Adelaide Library - Offers free e-books.
- PDF Books World - Provides free books on various topics.
- Bookyards - Contains free e-books.
- OAPEN - Includes open access academic books.