#LibriVox is a free audiobook site, where volunteers upload self-made audio recordings of public domain books:
The official site is at https://librivox.org but we would recommend the official mirror at Archive.org:
The audio quality is variable, but it is entirely free and you can use the reviews on Archive.org as a guide to quality.
@switchingsocial hey, wolnelektury.pl is a polish website/foundation that provides (mostly polish) ebooks and audiobooks of public domain works. worth sharing for polish speakers/learners!
It's on the public domain ebooks search page now, so people can use this to search for Polish language ebooks:
mastodon.at is a microblogging site that federates with most instances on the Fediverse.