We do Greenlight for this, which has a management app and a debit card. It's not perfect, but it's working well for our preteen son and is pretty flexible. We can add money when he completes chores and can partition what he can spend where. It works and he's definitely gaining more of an understanding of how to manage his money.
Edit - Greenlight also gives you a qr code and payment link that (e.g.) his grandmother can use to pay him for mowing her yard, etc. No cash involved.
I'd love to see Darkwatch get ported to PC and remastered. Loved it on ps2 and have it working at a somewhat cranked up resolution on emulator, but a legit updated PC port would be awesome.