You can find a large variety of online Ebook Selection, encyclopedias, Dictionaries and thesauruses in  digital form readable on computer or other electronic devices such as tablets and mobile phones.

• Directory of Open Access Book
• Ebooks4greeks
• Hellenic Academic Ebooks Kallipos
• MyeEbooks
• Free eBooks – Project Gutenberg

• Εncyclopaedias
• Altapedia Online
• Bartleby
• Biography
• Brittanica
• Encarta
• Infoplease
• Orient Encyclopedia
• Webopedia