Getaway - Rent a cabin to get away from it all
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!
Howsy - Making renting better for everyone
/Tab - The simple way to split a bill among friends.
Rent the Backyard - Get an apartment in your backyard at no cost to you
EquiTable - Split the bill fairly