Gnucash - A full-featured application to keep track of your finances.

Designed to be easy to use, yet powerful and flexible, GnuCash allows you to track bank accounts, stocks, income and expenses. As quick and intuitive to use as a checkbook register, it is based on professional accounting principles to ensure balanced books and accurate reports. GnuCash is backed by an active development community and is blossoming into a full-fledged accounting system. Developed under the GPL, you have no need to worry about obsolescence: GnuCash will be there for you.