Ανοικτή Βιβλιοθήκη:
Books/audio books/videos: Greek literature, translated literature, theater, education, culture etc.
Thank you very much 
hey
Euxaristw Niovi
https://www.ebooks4greeks.gr/ ← This is a really good source of free books too!
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https://www.smashwords.com is also a good website!
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You are welcome!
Να είστε καλά! Yes, “ebooks4greeks” is indeed a really good source!
Additionally, a great portal for Greek language and literature is “Η Πύλη για την ελληνική γλώσσα”: Η Πύλη για την ελληνική γλώσσα.