I totally recommend the Natural Reader app and the pdfdrive website if you’re a voracious reader. All the free pdf version books you could ever hope for, importable into Natural Reader for easy listening or reading, and of course also save them onto a thumb drive and your Start9 file server for your post apocalyptic library. Let me know and I can give you temp share access to my library. I have a ton of amazing books. 

 thanks, I'll look into Natural Reader. I mostly read articles or papers, so I don't need access to books that much, but what would be cool is to be able to save for later from both mobile and computer and the app would remember per article where I'm at. 

 Natural Reader is great because you can import any text, website or pdf into the app and simultaneously read AND hear the audio, massively upping your retention.