Dinngo - Splitting payments the fun and easy way
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!
Splittable - Shared living made simple
/Tab - The simple way to split a bill among friends.
Pay Tgthr - Set your split ratio, and when the card is used, Pay Tgthr will do the math and charge each partner's existing checking account.
BillSplit - Split bills with colleagues on Slack