NexusMods is working on their new post-vortex mod client, which does have Linux support. It can be found here on github.

That’s stupid. Nothing stops you from just installing regular Ubuntu if you love snaps so much.

There’s Librera FD, on F-droid. It’s the open source version of Librera on the google play store. I believe it strips out the google api/cloud stuff, but its db /reading status/etc are all easily synced via Nextcloud (which is what I do). The only real negative I’ve found with it is that it’s search for text in books is slow compared to more popular reading apps like Moon+ Reader.

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Aegis is for Android, Ravio is an iOS app.