clacct.sourceforge.net
Not all of us have CPA's or have 99% of our life to spend on balancing our checkbook. If you want an easy, straight-to-the-point method to balancing your budget, check out the Command-line Accountant! It handles multiple users (on UNIX-based systems), multiple accounts per user, IOU's, and more. For simplicity, it does not use check numbers. Its interface works purely on command-line arguments-- there is no interactivity whatsoever. The good news is that this makes clacct completely scriptable!