Mailinator - Any Inbox. Any Time.
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!
TempMail.altmails - Disposable temporary email addresses
Splittable - Shared living made simple
Harakirimail - Harakirimail is a free disposable email service. Just send email to anythingyouwant@harakirimail.
EquiTable - Split the bill fairly