GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
YouNeedABudget - Personal home budget software built with Four Simple Rules to help you quickly gain control of your money, get out of debt, and reach your financial goals!
Pecunia - Open Source HBCI Pin/TAN Online Banking Software.
Mint - Free personal finance software to assist you to manage your money, financial planning, and budget planning tools. Achieve your financial goals with Mint.
Grisbi - Accounting for everyone !
CalendarBudget - The easiest way to track and forecast your wealth - using a calendar.