Do you have an idea? Whether AlternativeTo nor OpenSourceAlternativeTo got an answer.
EDIT: I should have had added, that I was not looking for the financial aspects of the app, but I was looking for a possibility to store tickets and cards: Catima offers at least somewhat, what I was looking for.
Also, if the Flipper Zero can clone your bank's card, you should probably switch to another bank.
It's a neat tool, and it can definitely do a lot, but it's not magic, and it can't emulate decent cards with proper security. If your bank card doesn't have that, that's… an issue.