The Internet Public Library, the Internet Archive, and Project Gutenberg all offer free books available in the Spanish language through their websites. Interested individuals can visit the Internet Public Library at ipl.org, The Internet Archive at archive.org and Project Gutenberg at gutenberg.org.
Each of these libraries offers extensive collections of literature categorized by language, subject, author, intended audience and numerous other criteria. Out of the three libraries, the Internet Archive possesses the largest database of literature. It established itself more recently than both the Internet Public Library and Project Gutenberg, but Project Gutenberg stands as both the oldest and the smallest.