iLend - Keep track of the things you lend and borrow.
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!
Masterworks - Invest in the world’s most valuable paintings.
/Tab - The simple way to split a bill among friends.
8x10 - Sell signed, limited edition fine art with a single post
EquiTable - Split the bill fairly