public library systems use Overdrive for their ebook collections. You can download free books from your library system
Project Gutenberg is a digital library that uploads free public domain ebooks to make them available to the public
is a website that allows you to download five free ebooks a month. That is an easy way to download and read free ebooks.
There are many free ebooks available for download in various formats. Not all books are free, but they do have a lot of free options to look through