Catima - for saving arbitrary barcodes and stuff that are hard to integrate into other wallets. I keep my local library card in there, and it works wonderfully
Nonocross - fun little game that has zero frills and distractions. Also very responsive on their github to suggestions and improvements
Termux - when I need to get into things from afar, this is how I do it
Box, Box! - Formula 1 news, schedules, standings, etc
Coffee - Sometimes I want to keep the display awake, so this comes in handy