1. Librivox: Librivox is a non-profit initiative that offers free audiobooks from the public domain. Volunteers record the audiobooks, giving you access to classics and timeless pieces of literature.

2. Project Gutenberg: This well-known website contains over 60,000 free e-books and audiobooks in various languages. Their audiobook collection includes human and computer-generated narrations.

3. Loyal Books: Formerly known as Books Should Be Free, Loyal Books offers a wide range of free audiobooks and e-books from different genres, including children’s literature and non-fiction works.

4. Open Culture: Open Culture is a vast repository of educational and cultural content that includes free audiobooks. The site also provides access to movies, online courses, and language lessons.

5. LibriVox Audio Books: This app connects you to a vast library of free public domain audiobooks—every title available on LibriVox can be accessed through this mobile app.

6. ThoughtAudio: ThoughtAudio provides classic literature and philosophy titles in audio format for free, perfect for individuals interested in intellectual content.

7. Digital Book: Digital Book has thousands of free e-books and audiobooks available for immediate download or streaming on any device.

8. Audiobook Treasury: This website features a wide range of unabridged audiobooks from various genres – ensuring hours of listening enjoyment.

9. Learn Out Loud: Primarily designed to provide educational content, Learn Out Loud offers thousands of lectures, interviews, speeches, and other learning materials in addition to free audio titles in various categories.

10. OverDrive: OverDrive connects you to your local library’s digital media collection – simply sign up using your library card number and gain access to free e-books, audiobooks, movies, and more!

11. Lit2Go: Lit2Go is a collection of free audiobooks and poems available from the University of South Florida. Their audiobook library includes stories and essays in MP3 format.

12. Podiobooks: Podiobooks distributes serialized, high-quality audio podcasts that you can listen to or download for later enjoyment.

13. Storynory: If you’re searching for free children’s audiobooks, Storynory offers an array of fairytales, original stories, and classics.

14. Audiobook Boom: Receive one free audiobook every Tuesday by subscribing to Audiobook Boom’s newsletter, giving you exposure to newly released titles.

15. YouTube: You might be surprised to find numerous full-length audiobooks uploaded on YouTube channels dedicated to this purpose.

16. Free Classic Audiobooks: This website lives up to its name by offering classic literature in audiobook format – all available to download in either MP3 or m4b formats.

17. Sync: Sync is an annual initiative that offers two free audiobook downloads for young adults every week throughout the summer months, perfect for keeping your teenagers entertained.

18. Hoopla: Hoopla is another digital media resource that partners with libraries to provide instant access to e-books, audiobooks, movies, music, and television series – all accessible with a
library card!

19. Google Play Books: Android users can take advantage of Google Play Books’ selection of free public domain books with accompanying audio narrations.

20. Spotify: While Spotify is primarily a music streaming platform, it also boasts a growing collection of free audiobooks sprinkled among its millions of tracks.

These 20 resources offer fantastic opportunities for listeners to explore new titles and enjoy their favorite literature through audiobooks for free!