Free Public-Domain Books
Legally free books — public domain or openly licensed by their authors/publishers.
- Project Gutenberg — 70,000+ free public-domain ebooks.
- Open Library — Free digital lending library.
- Standard Ebooks — Beautifully formatted public-domain classics.
- FreeTechBooks — Free technical and computer science books.
- OpenStax — Free peer-reviewed college textbooks.
- Project Gutenberg (Portuguese) — Public-domain books in Portuguese.