As in earning sats? If so the biggest one for me is the fold card. I also use fountain for podcasts and lately I’ve been using sMiles. That tracks distance walked and gives you a tiny bit of sats. I’m on my feet just about all day and I average about 10k steps according to them which usually nets me about 15 ish sats. Not much but I think one day those 15 sats will buy me a fancy coffee.