Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Paperless Post - Paperless Post is an online platform for creating custom card and invitations.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Feathr - Feathr is a marketing platform designed just for event organizers.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Followme - FollowMe from Ringdale is the complete document output management solution, which provides unrivalled flexibility for organizations looking to reduce costs, increase security and improve efficiency.