Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.
TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Prekindle - Prekindle is a simple yet powerful event management, ticketing, and marketing platform that helps businesses to sell tickets to the event online and spread the word.