SPB Finance - SPB Finance is a financial manager that you can carry in your pocket.
GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
HomeBank - HomeBank is a free software. Use it to manage your personal accounts. It is designed to easy to use.
Ledger-cli.org - Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line.
Fentury - Personal financial advisor, money & budget manager
My Expenses - Easy to use and open source personal finance manager for Android.