Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
TicketPeak - Online Ticketing Software
Event Hunt - Startups and Tech Events Curated By Locals
TicketingHub - Next generation of Ticketing
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
High Trek POS - High Trek POS is a mobile POS software that helps you manage your events, Ticketing, donations, and marketing.