Though I'd give nods to:

- Termux, of course. Linux-on-Android userland. There's a suite of related apps which I also install (e.g., Termux:API and Termux:Styling.) There's a black-on-white theme which works quite well (default is white-on-black, not so much).

- F-Droid. FOSS archive repo, independent of Google Play.

- Aurora Store. Alternative interface to Google Play.

- APK Mirror. Direct access to app installs, though not managed (no updates).

- Hacker's Keyboard. Far preferable to Android or Onyx defaults.

- A podcast app. I'm using AntennaPod (FOSS), have also used PodcastRepublic in the past.

- RSS Feed reader, though I'm finding I don't make much use of this. Feeder seems to be the default.

- Internet Radio player. Transistor is one option. Not something used frequently, but handy to have.

A few others though most are very occasionally used and/or disappointments (e.g., Mozilla's Pocket App, which has been an absolute shitshow, despite potentially filling a critical niche). For the most part I avoid anything that has an account associated with it, largely to avoid distractions. Though also because tablets are shitty generative tools. Adding a Bluetooth keyboard helps slightly, but Android still throws in far too many limitations.