RentHoop - Tinder for finding roommates
Stealthy: Secret Messenger - Chat anonymously with friends & strangers
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!
Vuash - Send secret messages safely.
Pack - Makes it simple to find the best roommates.
Phonebot - Make phone calls from within a Slack channel