BillMonk - Billmonk lets you keep track of debts between friends.
Tricount - Manage and share expenses with friends
PocketGuard - PocketGuard categorizes and organizes your expenses, monthly bills and subscriptions into clear, beautiful tabs and graphs, so you will always be on top of your finances.
Kittysplit - The easiest way of sharing costs with a group of friends
Goodbudget - A home budget app based on the envelope budget system. Available on the web, Android, and iPhone.
ihatemoney - Manage your shared expenses, easily