kindle ebooks on Amazon always has a lot of free books and the list changes all the time. You can install the free kindle app on your windows pc or android device and download the books to there.

Hi Osama, What I immediately thought of was the site Librivox, for *audiobooks* that are free because they are in the public domain.

https://www.gutenberg.org/ - has texts that are out of copyright. Many. Not just English.