Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Brüha - Brüha is your local entertainment and ticketing platform.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
UMOOV - The activities and events nearby you.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Patook - Platonic Friend Making and Community App