Mint
A while back Jon found a website that automatically tracks your spending from your credit card and checking accounts.
It allows you to state a budget and categorizes what you’ve spent into the budget.
So the point being it keeps track of your budget for you. No entering receipts into a spread sheet, no guessing what you have left since you haven’t entered receipts into the spread sheet.
So all you have to do is log on and see where you are that month in spending and see what’s left.
Of course it only works if you do things electronically, and since we do it’s perfect for us.