Splitwise!

SETTLE UP is an indispensable app for friends and flatmates who need to keep track of shared bills and expenses. It comes in handy when you're planning a group trip or a party and don't want to have it ruined by constant discussions over "who paid" and "who should pay". This app will help you settle the debts and the emotions.

Kittysplit is the easiest way to share group expenses. Period.

The goal is to automatically calculate cost allocations at a group event, by simply entering the spending paid by each person and the list of participants. In a few seconds the tool tells you who has to pay back how much to whom. You can send a link to the result by email.Easy to use and quick entry.No login.

WieBetaaltWat (WhoPaysWhat) is a service that allows you to easily settle expenses with a group of people. You can use WieBetaaltWat for:

A free tool to manage household IOUs with roommates, split bills and track group expenses so that everyone gets paid back. On the web, iPhone, and Android.

Splid helps friends manage their money.Perfect for vacations, share housing and groups who need to share expenses, Splid keeps track of every transaction and shows who owes whom how much. It is simply the easiest way to manage group expenses.

Memodude keeps track of who you lent to, reduces your receivables and gets rid of bad payers. A unique algorithm cancels out debts and keeps your preferences into account when doing so: which connections you prefer owing you and of which you are doubtful that they will repay you. Memodude does not need groups: you can memo everyone with an email address.

Tricount makes sorting out your group expenses easy when you organize group activities. Create your group expenses reports directly on your iPhone or iPod Touch during your activity. Enter the participants names and their expenses, Tricount calculates the money owed and debts of everyone. You can upload the report on http://www.tricount.com and the URL of the tricount may be shared by e-mail. In that way, participants can correct the data you have added before starting paying back.

Create event, add users and their expenses. SplittyPie will calculate who owes who and how much exactly. It's Free and with No Sign Up.

This is a really tiny app to ease the shared houses budget management. Keep track of who bought what, when, and for who to then compute the balance of each person.

Tabbt is the best way to share everyday expenses with your friends. A Tab is created within seconds: After paying for your group, you enter the total amount, add your friends and hit send. All Tabs add up to an ongoing balance. No more shuffling coins! Pay your friends back by picking up the next bill instead.

Billmonk lets you keep track of debts between friends.

I.O.U Mate is a free online tool that lets you track your debts (dinner splits, loaned books etc) with your friends and family. You can choose to track your debts privately or invite your friends to view and update your shared debts via a simple interface. Moreover, you can schedule and receive reminders for recurring payments such as kid’s allowances or rent. ( from makeuseof.com)

With MoneyMe you can control your daily costs using your Android mobile and your PC. You can insert quickly and easily your expenses and start making stadistics.You can create budgets, organize your debts and administrate all of your coupons with a simple interface that it can help you a lot.