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!
iLend - Keep track of the things you lend and borrow.
Splittable - Shared living made simple
Masterworks - Invest in the world’s most valuable paintings.
EquiTable - Split the bill fairly
8x10 - Sell signed, limited edition fine art with a single post