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

FUEL CYCLE by Passenger - Think Passenger builds online platforms that allow brands to connect, create and communicate with key stakeholders.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Crowded Communities - The all-in-one community platform.

Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.

Mobilize - Mobilize is a scalable messaging app built for large groups.