I bought a sponge of sorts advertised as for getting pet hair out of bed sheets. I’ve no pets, but stress makes me lose tons of hair and I’ve long hair. It works like marvel for my own hair! It’s so life changing! I love it!
I was also able to get a mini white paint with a mini roller for practically nothing to finish off the wall fixes I was doing.
I also got a tiny brush meant for keyboards and discovered my keyboard was super nasty with my hair on the inside. >____<
I just use 9 key/excel. Guess it’s not as portable as a physical calculator.
If you are doing spreadsheet type stuff than of course excel… well… excels.
But in case you are just using it as a way to type in arbitrary formulas, you should check out speedcrunch (GPL) for linux mac windows. You can just type in formulas and they stay in scroll back like a terminal. Instead of being constrained by mimicking a physical calculator, these people have actually thought about what would make a calculator functional on a PC. And since it has persistent history (unless you delete it) it does have some benefits of a printing calculator.