GnuCash Double-Entry Accounting Program.

You Need a Budget combines easy software with Four Simple Rules to help you quickly gain control of your money.

Toshl helps you tack all your credit cards, bank accounts and cash in one place.

Mint.com is a free, web-based personal financial management service.

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