Athena VS LibreraReader

This setup can be used to create a 'push button' assistant (which is in fact what I am in the process of setting it up for) where you quickly record your command, and once finished it runs through the whole processing pipeline. I will be releasing more python/java scripts to do just this, and eventually turning it into a native Android app once I've formalized some of the design. I figured it was something people in this sub might be interested in. You can get the APK, the sample launching script, and the setup instructions on my Github. If you're interested in following the project you can do so at r/SapphireFramework

This project is still in early but you could like it https://github.com/Tadashi-Hikari/Athena

Google Assistant: Dicio is already on F-Droid but it won't get what you are saying. Possible actions are limited. There's also Athena that's in development, though it is not ready for any kind of use. Depending on whether you need some sort of an accessibility service, you can get away with ditching Ok Google / Alexa / Cortana / Bixby. TalkBack should help with it too.

Along with what you said, the Athena project also seem like interesting - even though you have to build it. Yet this video indicates that the developer knows what he is doing

Athena - intends to completely replace Google assistant,

Athena and the Sapphire framework

I've been rather happy with Librera, although when reading foreign languages, I prefer KOReader for its locally installed dictionary lookups (you have to add them). Note that these are both reader software, first, and not advanced library management packages (as far as I know).

The last I checked, Librera also had two versions on the Play store, with the paid pro (or whatever) version sending a few dollars towards the Ukrainian developer. Who's been donating to the defense efforts since the war started. Or was; that language now appears to be gone from the web site.

Anyway, for those not familiar with FDroid and/or who want to contribute to development other that via PayPal -- or, looks like now that would be Patreon.

https://librera.mobi/

For those who asked: Humble Bundle is another source of DRM-free ebooks.

Google Docs → Librera Reader, Collabora Office

On Android, the text-to-speech I find is better with https://librera.mobi/

Looks like it has been suggested at least once on GitHub. Maybe give a +1 to that issue to show interest?

Librera Reader (version 8.9.12): Book and PDF reader

I use Libera which has everything i need for a reader, to view full-screen is essential bc it makes use of all the space on phone.

Librera reader, perhaps? https://librera.mobi/

I personally use Librera on Android with google translate.