Free Audio Books: LibriVox-Public Domain Audio Books
The LibriVox site has free audio book recordings that are in the
public domain.
Some books are recorded by different speakers, so the quality of
the audio recording can vary.
Canadian Site for Project Gutenberg Public Domain E-Books: Project Gutenberg Canada
Project Gutenberg has various sites on the Internet which means book titles can vary based on local country laws.
The primary site for Project Gutenberg is: Project Gutenberg