• Money Manager Ex©

From author's site:

Money Manager Ex© is a free, open-source, cross-platform, easy-to-use personal finance software. 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.

Money Manager Ex is a complete rewrite of the original Money Manager .NET. It can run on Windows and Linux currently and a port to other platforms can be made if required.