All great suggestions, and most I also use.

Also use Obsidian for note taking, Organic Maps for mapping. I actually chose NOT to run google services (or whats the point), so this is a great map replacement, all maps are downloaded so usable offline with just GPS (great for no cell signal). Collabora Office for docs, Feeder for RSS, KurobaEX for 8kun (lol).

Biggest downside not having Google Play Services so far is that Pheonix Wallet requires it for notifications to the lightning channel, so had to abandon that.