Tabbt - Tabbt takes the hassle out of handling money among friends.
Ledger-cli.org - Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line.
Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!
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!
Kittysplit - The easiest way of sharing costs with a group of friends
Money Tracker Pro - K-Tech Systems - experts in the world of .Net