Paperless Post - Paperless Post is an online platform for creating custom card and invitations.

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

GruupMeet - Simplified Meeting Logistics

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

Ticket Tailor - Ticket Tailor is an easy-to-use event ticketing platform that allows event organizers of all shapes and sizes to sell tickets online.

Bigtent - BigTent is a web-based organization and communication portal for groups.