Tribeez - Flatshares, families, friends...

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

ihatemoney - Manage your shared expenses, easily

Raft Calendar - A fun and beautiful calendar for couples and close friends

Gong - Gong uses AI to analyze spoken conversations from audio sources and web conferencing platforms such as Cisco WebEx, GoTo Meeting and Zoom.

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!