Mint is a free software run by the same people who run TurboTax. It links to your bank accounts, credit cards, etc. and helps you manage your budgets on a monthly and yearly basis.
While it’s intended for personal use, it would also make a great budgeting tool for libraries. You can see in one easy to navigate location how much you’ve spent with any one merchant, on any one type of expense, and monitor spending on all of the library’s accounts and cards. It provides charts, email notifications when you’re reaching an allocated budget, and projected savings/spending over a time period.