Planning monthly budget is very significant thing for every individual.It helps him to spend his money wisely. It is very basic computer project still very useful to begin understanding how we can write professional codes.
Family Monthly Budget Planner :Microsoft provides free monthly budget planner in MS Excel. It would be good start for beginners who wants to get feel of project before actually start coding it.
DS Budget Home : is a simple, open source budgeting program for everyone written by Soichi Hayashi
Grisbi : is a personal accounting application running under GNU/Linux and Windows, released under the GPL license