GnuCash Double-Entry Accounting Program.

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

Moneydance is a personal finance software application.

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

KMyMoney strives to be the easiest open source personal finance manager to use, especially for the non-technical user.

taskblitz is set of tools to collaboratively get your work done including project management, chat, time tracking and invoicing.