YNAB (You Need A Budget) - one of the most popular budgeting tools - is on Winter Sale on Steam for $14.99, a 75% discount.
http://store.steampowered.com/app/227320The software doesn't usually go lower than this price more than once a year. Regular price is $60 (and, people report, worth every penny). Now is the opportunity to get it for those who were on the fence like myself.
The software is offered on YNAB website for free for college students, but you need to email proof of enrollment, and I personally thought that the team deserves monetary recognition for developing a great product.
You don't need to go through Steam client to use the software every time. Install YNAB and run via Steam for the first time, Then go to Help -> About YNAB -> Copy Activation Key to Clipboard. Download the trial version from YNAB site, and then enter the saved activation key. You will now have a standalone version.