GoToWebinar - Webinar & Online Conference | GoToWebinar

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

Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.

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

WebEx - Cisco WebEx Web Conferencing, Online Meetings, Desktop Sharing, Video Conferencing

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