CNN/Money debt planner — Enter your credit card (or loan, I suppose) balances, interest rates, and minimums. It figures out what you should pay toward each to get out of debt soonest while paying the least interest. Spiff.
I’m a front end developer at Equinox OLI, working on open source library software. I was previously a freelance WordPress developer in higher education. You can get in touch here or on LinkedIn.