Volunteers around the world record audio versions of public-domain books, providing a vast number of free audiobooks in English and other languages.
Volunteer Community for Free Audiobooks
Click the "Visit Site" button on this page to open the official LibriVox website, then follow its on-screen instructions.
LibriVox is accessed online through your browser, so there is usually no local installation. Refer to its official site for details.
You can browse comparable reading sites under the e-books category on this site and pick the one that fits you.