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!
Pack - Makes it simple to find the best roommates.
EquiTable - Split the bill fairly
Housing Anywhere - The international student housing platform
Splittable - Shared living made simple
Kopa Housemate Finder - Find furnished apartments and housemates for 1+ months