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!
HippityPip - Teach phone numbers to kids
Kittysplit - The easiest way of sharing costs with a group of friends
Allowcation - Simple allowance and financial allocation tracking for kids
ihatemoney - Manage your shared expenses, easily
Inbox Creature - A super cute virtual pet, delivered right to your inbox.