Need a way to know how much you and your roommate owe in rent, gas, and electricity bills? Buxfer can help you keep track how much everyone owes in shared expenses. Buxfer is a simple little Web app that lets you set up accounts for shared expenses and keep track of who and who hasnâ€™t paid. Now you can get rid of those pesky sticky notes telling your roommate they need to pay up. Just send them an email. Pretty slick.