Is there any way to download them all? Ebooks are very small so it shouldn't be a problem to make an archive, or at least have a way to use curl/wget to download them all from a directory.
https://standardebooks.org/opds/
I’ve never really been able to get it to work with calibre, pretty much the standard go to piece of software for all things ebooks.
I would be interested in hearing about any tips for getting an opds working.
curl -s https://standardebooks.org/opds/all | grep -oE "/(.*).azw3" | sed -e"s/^/https:\/\/standardebooks.org/" | xargs -n 1 curl -O
P.S. Calibre seems to only work with them and the kindle when you send over USB (I keep my paperwhite in airplane mode, signed out, ads disabled)[0]