A few I haven’t seen mentioned:

• Moon+ Reader - My favorite ebook reader of all time.
• Tea Time - Simple timer widgets
• Simple Time Tracker - Track what you do
• NES.emu, Snes9x EX+, M64+ FZ - Emulators
• Thunder - Lemmy
• Root Explorer - file explorer
• Lichess - Chess, free of ads, no fees. Almost entirely FOSS.

Also +1 to the usual favorites: Firefox, Termux, Nova, etc.

Kubuntu currently is working really well for me. I’m not a hardcore Linux user (used it lightly for many years, daily driver for only couple), so it’s nice to use Ubuntu where there’s plenty of online answers. Plus I like KDE. So Kubuntu is a good fit.

I recently tried Fedora for a while, but I just had problem after problem with my hardware. It was good aside from that.