Cron - Cron Calendar.

RentHoop - Tinder for finding roommates

zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.

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!

Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.

Pack - Makes it simple to find the best roommates.