The bills, the boiler service, the babysitter's phone list, what is actually in the freezer. It all lives in someone's head until that person is ill or away. This puts it on paper.
Twenty-five pages, none of them dated, so you print once and use it for years. Every page stands on its own — print the cleaning section and skip the rest if that is all you need.
Put the weekly cleaning schedule and the chore chart in a clear sleeve and write on them with a whiteboard marker. Wipe clean on Sunday, start again.
SpreadsheetZero-based budgeting for Excel & Google Sheets: every euro gets a job and the sheet does the adding up.
SpreadsheetSnowball and avalanche side by side — it tells you which method is cheaper for your debts.
BinderEverything your family would have to look for, written down once. 17 printable pages.