Money Manager Ex is a free, open-source, cross-platform, easy-to-use personal finance app. It primarily helps organize one's finances and keeps track of where, when, and how the money goes. It is also a great tool to get a bird's-eye view of your financial worth.
Money Manager includes all the basic features that 90% of users would want to see in a personal finance application. The design goals are to concentrate on simplicity and user-friendliness - something one can use everyday.
Note: Now requires OS X 10.9 or later running on a 64-bit Intel processor
Note: Although Finder indicates that this is version 1.0, the developer states that this is version 1.3.3.