The article is about finding ebooks for a Kindle but Project Gutenberg has books for every electronic device, include desktops and laptops.
And hereās another:
If youāve got a library card, youāve got access to free ebooks. OverDrive is an online service that allows library card holders to download free ebooks (and movies and audio content, too) from their public library, school or institutionās collection to their Kindles. The more library cards you have in your name, the more books you have access to.
And yet another:
A project of the Internet Archive, Open Library provides access to well over one million free ebooks. It bills its offerings as āthe worldās classic literature at your fingertips,ā but that doesnāt mean itās a museum of moldy oldies. While youāll find enough literary canon to make an AP English teacher beam with joy, the virtual shelves are also stocked with bestselling authors like Stephen King and Tom Clancy, kid-lit series like Captain Underpants and Diary of a Wimpy Kid, and a host of academic texts. Given Open Libraryās stated goal is āto make all the published works of humankind available to everyone in the world,ā youāre likely to find what youāre looking for here.
And he continues with all sorts of other sources @ How to get free books for your Amazon Kindle