[sgc]

Librivox has a very open api:

https://librivox.org/api/info

For example, you can query using only the first letter, so it's quite easy to quickly cache their entire collection (please don't give them the HN hug of death):

https://librivox.org/ ... api/feed/audiobooks/author/^a

Of course, specify json or something closer to your internal data structures.