revised : January 2015

Sources of free public domain books
http://ebookfriendly.com/free-public-domain-books-sources/

ABU (Association des Bibliophiles Universels)
http://abu.cnam.fr/

Andy Holt Virtual Library
http://www.utm.edu/staff/bobp/vlibrary/docust1.shtml

Athena (e-books en Français)
http://un2sg4.unige.ch/athena/html/athome.html

Austrian Literature Online
http://www.literature.at/webinterface/library

Authorama (Public Domain Books)
http://www.authorama.com/

Biblioteca (progetto Manuzio)
https://www.liberliber.it/online/opere/libri/

Biblioteca dei Classici Italiani
http://www.classicitaliani.it/

Biblioteca Italiana
http://www.bibliotecaitaliana.it/

Books-on-line
http://www.books-on-line.com

Carrie
http://vlib.iue.it/carrie/

Classics Archive, The Internet
http://classics.mit.edu/index.html

De Bibliotheca (Classici della Letteratura Italiana)
http://digilander.libero.it/bepi/

Digital Book Index
http://www.digitalbookindex.com/about.htm

e-books Directory
http://www.e-booksdirectory.com/

Ebook Search Engine (Free Books for Download)
http://www.ebook-search-engine.com/

elaleph (Libros en castellano)
http://www.elaleph.com/

Electronic Text Center (University of Virginia)
http://etext.lib.virginia.edu/uvaonline.html

Electronic Text Collections (Western European Literature)
http://www.lib.virginia.edu/wess/etexts.html

Electronic Text Collection (History)
http://history.hanover.edu/etexts.html

Electronic Texts in Philosophy
http://www.epistemelinks.com/Main/MainText.asp

English Server (University of Washington)
http://eserver.org/

Free Online Books
http://www.PageByPageBooks.com/authorlist.html

Gallica Classics (Littérature Française)
http://gallica.bnf.fr/

Google Book Search
http://books.google.com/

Great Books and Classics
http://www.grtbooks.com/

Internet Public Library (List of Online Texts)
http://www.ipl.org/div/subject/browse/hum60.60.00/

Letteratura Italiana
http://www.letteraturaitaliana.net/

Literature Network, The
http://www.online-literature.com/

Luminarium (English Literature)
http://www.luminarium.org

Online Library of Liberty, The (Liberty Fund)
http://oll.libertyfund.org/?option=com_staticxt&Itemid=29

Miguel de Cervantes (Spanish Literature)
http://www.cervantesvirtual.com

On-Line Books Page
http://digital.library.upenn.edu/books/

Open Library
https://openlibrary.org/

Oxford Text Archive, The
http://ota.ahds.ac.uk/

Perseus Projects (Greek Texts)
http://www.perseus.tufts.edu/

Planetbook
https://www.planetebook.com/

Project Gutenberg
https://www.gutenberg.org/

Projecto Vercial (Portuguese Literature)
http://alfarrabio.di.uminho.pt/vercial/obras.htm

Projekt Gutenberg-De (Books in German)
http://gutenberg.spiegel.de/

Read Print (Online Books, Poems, Short Stories)
http://www.readprint.com/

Text Archive
http://www.archive.org/details/texts

Wikipedia : list of digital library projects
http://en.wikipedia.org/wiki/List_of_digital_library_projects

Wikisource : free libraries (in various languages)
http://wikisource.org/wiki/Main_Page