GnuCash is a free and open source personal / small-business financial-accounting software, available for Mac OS X, GNU/Linux, BSD, Solaris, and Microsoft Windows.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. Here are some key features of \"GnuCash\":