GnuCash Double-Entry Accounting Program.

MonkeyPeanuts.com is an online personal finance tool to help you manage your budget and save money.

HomeBank is a personal accounting software package that runs on OpenBSD, Linux, FreeBSD, Microsoft Windows, Mac OS (via macports or homebrew) and AmigaOS.

moneyGuru helps you compare loans, credit cards, mortgages and life insurance online.