Flat World Knowledge offers textbooks for free online for educational or personal use. They also offer convenient, low-cost textbook choices for students in different formats including print, audio, by-the-chapter, and...

Educators and learners interested in free digital textbooks, either to supplement or to replace traditional textbooks, may want to check out OpenStax. This nonprofit initiative at Rice University "publish[es]...

Learners and educators in search of free textbooks may find a solution in LibreTexts, a nonprofit project that describes itself as "a multi-institutional collaborative venture to develop the next generation of...