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

Arcat.XP - Arcat.XP is an Event Management Software that helps organizers, attendees, exhibitors, and sponsors to manage their events with ease from start to finish.

Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.

Digitevent - The powerful software to manage your event participants.

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

Wisembly - Find out more about Wisembly, the web & mobile solution which you can use to prepare and hold your meetings, and ensure they are followed up.