I haven't seen these mentioned but they are kinda niche though. I use them for work more than personal usecase but maybe someone else finds them useful.
Copy on select - highlighted text is automatically copied
Snap links - open multiple links or check several boxes using a click-drag interface
Anuto Tower Defense
Pretty decent time killer if you like TD games
Retro games
This one because nostalgia
40 Puzzles
This came with some linux distro and I was able to find it on f-droid. Some of the games are better than others. Lots to choose from.