I’ve got some standing orders of 1 or 2 euros every month for bigger projects like grapheneos and kde. And for small apps that I actively use, I try to donate 5 or 10 euros now and then. It’s not much but I believe if everyone is doing their part we succeed in the long run
Every month about 10-20 euro, but nothing recurring. I setup a list of my open source tools and I try to one at a time donate to each one. But its a slow process and feels too less, but I don’t want to do recurring ones, though I know it would be the best for the projects.