[alx__]

I've been using KyBook 3 http://kybook-reader.com

Enable the Calibre web server, then use KyBook to connect to it and download the books you want while on the same network as the Calibre server. You can set up a public URL if you want to access them remotely

[mattkevan]

I do something similar by running Calibre Web on a raspberry pi and then using KyBooks on my devices. It works really well.