/Tab - The simple way to split a bill among friends.
ChangeTip for iPhone - Send and receive dollars and bitcoin on social (with emoji!)
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!
Facebook Pay - Send money to your friends via Messenger
Splittable - Shared living made simple
Square Cash - Email money to Anyone