PayPal.Me - Request money using your own personalized URL.
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!
AlienRent - Have any spare tools lying around, why not rent them out in your local community?Want to build something or fix something around the house but don't want to spend a lot of money on a tool you might only use once, why not rent them from AlienRent!
Splittable - Shared living made simple
Diggsweep - Easily create your own 'garage sale' to share with others
EquiTable - Split the bill fairly