Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Nightout - The standard in event ticketing and marketing by NIGHTOUT
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
Airbnb - Book unique places to stay and things to do.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
TickPick - Purchase tickets to your favorite events with no hidden fees