Millions of people use Any.DO to remember everything they have to do. With Any.DO you can easily capture all the things you want to do and make sure you get them done. It’s free, simple, & fun.Free

Grocery Smart from Handmark is a free mobile grocery list/shopping list that can be synced and shared across multiple users and devices. With Grocery Smart, you can create a shopping list on a PC, then access and update later from your Android device. Grocery shopping is made even easier with our new “My Cards” feature which allows you to store your key ring grocery loyalty cards in the app for easy reference at the checkout. Finally, the grocery list syncing and sharing functionality ensures that everyone has access to the full list of grocery items needed by all household members, right on their mobile device.Free

Splitwise is the best way to share bills and IOUs and make sure that everyone gets paid back.

Use Splitwise to split household bills with roommates, to figure out costs for a group vacation, or just to remember when a friend spots you for lunch. On the iPhone or on the web (http://splitwise.com), you can view your balances, track spending trends, set up email reminders for bills, and much much more! Free